Implement actions (#21937)

Close #13539.

Co-authored by: @lunny @appleboy @fuxiaohei and others.

Related projects:
- https://gitea.com/gitea/actions-proto-def
- https://gitea.com/gitea/actions-proto-go
- https://gitea.com/gitea/act
- https://gitea.com/gitea/act_runner

### Summary

The target of this PR is to bring a basic implementation of "Actions",
an internal CI/CD system of Gitea. That means even though it has been
merged, the state of the feature is **EXPERIMENTAL**, and please note
that:

- It is disabled by default;
- It shouldn't be used in a production environment currently;
- It shouldn't be used in a public Gitea instance currently;
- Breaking changes may be made before it's stable.

**Please comment on #13539 if you have any different product design
ideas**, all decisions reached there will be adopted here. But in this
PR, we don't talk about **naming, feature-creep or alternatives**.

### ⚠️ Breaking

`gitea-actions` will become a reserved user name. If a user with the
name already exists in the database, it is recommended to rename it.

### Some important reviews

- What is `DEFAULT_ACTIONS_URL` in `app.ini` for?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1055954954
- Why the api for runners is not under the normal `/api/v1` prefix?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1061173592
- Why DBFS?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1061301178
- Why ignore events triggered by `gitea-actions` bot?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1063254103
- Why there's no permission control for actions?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1090229868

### What it looks like

<details>

#### Manage runners

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205870657-c72f590e-2e08-4cd4-be7f-2e0abb299bbf.png">

#### List runs

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205872794-50fde990-2b45-48c1-a178-908e4ec5b627.png">


#### View logs

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205872501-9b7b9000-9542-4991-8f55-18ccdada77c3.png">



</details>

### How to try it

<details>

#### 1. Start Gitea

Clone this branch and [install from
source](https://docs.gitea.io/en-us/install-from-source).

Add additional configurations in `app.ini` to enable Actions:

```ini
[actions]
ENABLED = true
```

Start it.

If all is well, you'll see the management page of runners:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205877365-8e30a780-9b10-4154-b3e8-ee6c3cb35a59.png">


#### 2. Start runner

Clone the [act_runner](https://gitea.com/gitea/act_runner), and follow
the
[README](https://gitea.com/gitea/act_runner/src/branch/main/README.md)
to start it.

If all is well, you'll see a new runner has been added:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205878000-216f5937-e696-470d-b66c-8473987d91c3.png">

#### 3. Enable actions for a repo

Create a new repo or open an existing one, check the `Actions` checkbox
in settings and submit.

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205879705-53e09208-73c0-4b3e-a123-2dcf9aba4b9c.png">
<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205879383-23f3d08f-1a85-41dd-a8b3-54e2ee6453e8.png">

If all is well, you'll see a new tab "Actions":

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205881648-a8072d8c-5803-4d76-b8a8-9b2fb49516c1.png">

#### 4. Upload workflow files

Upload some workflow files to `.gitea/workflows/xxx.yaml`, you can
follow the [quickstart](https://docs.github.com/en/actions/quickstart)
of GitHub Actions. Yes, Gitea Actions is compatible with GitHub Actions
in most cases, you can use the same demo:

```yaml
name: GitHub Actions Demo
run-name: ${{ github.actor }} is testing out GitHub Actions 🚀
on: [push]
jobs:
  Explore-GitHub-Actions:
    runs-on: ubuntu-latest
    steps:
      - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by GitHub!"
      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
      - name: Check out repository code
        uses: actions/checkout@v3
      - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
      - name: List files in the repository
        run: |
          ls ${{ github.workspace }}
      - run: echo "🍏 This job's status is ${{ job.status }}."
```

If all is well, you'll see a new run in `Actions` tab:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205884473-79a874bc-171b-4aaf-acd5-0241a45c3b53.png">

#### 5. Check the logs of jobs

Click a run and you'll see the logs:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205884800-994b0374-67f7-48ff-be9a-4c53f3141547.png">

#### 6. Go on

You can try more examples in [the
documents](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions)
of GitHub Actions, then you might find a lot of bugs.

Come on, PRs are welcome.

</details>

See also: [Feature Preview: Gitea
Actions](https://blog.gitea.io/2022/12/feature-preview-gitea-actions/)

---------

Co-authored-by: a1012112796 <1012112796@qq.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

templates/repo/actions/list.tmpl

@@ -0,0 +1,27 @@
+{{template "base/head" .}}
+<div class="page-content repository">
+	{{template "repo/header" .}}
+
+	<div class="ui container">
+		<div class="ui grid">
+			<div class="four wide column">
+				<div class="ui fluid vertical menu">
+					<a class="item{{if not $.CurWorkflow}} active{{end}}" href="{{$.Link}}">{{.locale.Tr "actions.runs.all_workflows"}}</a>
+					<div class="divider"></div>
+					{{range .workflows}}
+						<a class="item{{if eq .Name $.CurWorkflow}} active{{end}}" href="{{$.Link}}?workflow={{.Name}}">{{.Name}}</a>
+					{{end}}
+				</div>
+			</div>
+			<div class="twelve wide column content">
+				<div id="issue-filters" class="ui stackable grid">
+					<div class="six wide column">
+						{{template "repo/actions/openclose" .}}
+					</div>
+				</div>
+				{{template "repo/actions/runs_list" .}}
+			</div>
+		</div>
+	</div>
+</div>
+{{template "base/footer" .}}

templates/repo/actions/openclose.tmpl

@@ -0,0 +1,10 @@
+<div class="ui compact tiny menu">
+	<a class="{{if not .IsShowClosed}}active {{end}}item" href="{{$.Link}}?workflow={{.CurWorkflow}}&state=open">
+		{{svg "octicon-issue-opened" 16 "mr-3"}}
+		{{.locale.Tr "actions.runs.open_tab" $.NumOpenActionRuns}}
+	</a>
+	<a class="{{if .IsShowClosed}}active {{end}}item" href="{{$.Link}}?workflow={{.CurWorkflow}}&state=closed">
+		{{svg "octicon-issue-closed" 16 "mr-3"}}
+		{{.locale.Tr "actions.runs.closed_tab" $.NumClosedActionRuns}}
+	</a>
+</div>

templates/repo/actions/runs_list.tmpl

@@ -0,0 +1,25 @@
+<div class="issue list">
+	{{range .Runs}}
+		<li class="item df py-3">
+			<div class="issue-item-left df">
+				{{template "repo/actions/status" .Status}}
+			</div>
+			<div class="issue-item-main f1 fc df">
+				<div class="issue-item-top-row">
+					<a class="index ml-0 mr-2" href="{{if .HTMLURL}}{{.HTMLURL}}{{else}}{{$.Link}}/{{.Index}}{{end}}">
+						{{.Title}} <span class="ui label">{{RefShortName .Ref}}</span>
+					</a>
+				</div>
+				<div class="desc issue-item-bottom-row df ac fw my-1">
+					<b>{{if not $.CurWorkflow}}{{.WorkflowID}} {{end}}#{{.Index}}</b>: {{$.locale.Tr "actions.runs.commit"}}
+					<a href="{{$.RepoLink}}/commit/{{.CommitSHA}}">{{ShortSha .CommitSHA}}</a>&nbsp; {{$.locale.Tr "actions.runs.pushed_by"}} {{.TriggerUser.GetDisplayName | Escape}}
+				</div>
+			</div>
+			<div class="issue-item-right">
+				<div>{{TimeSinceUnix .Updated $.locale}}</div>
+				<div>{{.Duration}}</div>
+			</div>
+		</li>
+	{{end}}
+</div>
+{{template "base/paginate" .}}

templates/repo/actions/status.tmpl

@@ -0,0 +1,12 @@
+{{if .IsWaiting}}
+	<i class="commit-status circle icon gray"></i>
+{{end}}
+{{if .IsRunning}}
+	<i class="commit-status circle icon yellow"></i>
+{{end}}
+{{if .IsSuccess}}
+	<i class="commit-status check icon green"></i>
+{{end}}
+{{if .IsFailure}}
+	<i class="commit-status warning icon red"></i>
+{{end}}

templates/repo/actions/view.tmpl

@@ -0,0 +1,8 @@
+{{template "base/head" .}}
+
+<div class="page-content repository">
+	{{template "repo/header" .}}
+	<div id="repo-action-view" data-run-index="{{.RunIndex}}" data-job-index="{{.JobIndex}}" data-actions-url="{{.ActionsURL}}"></div>
+</div>
+
+{{template "base/footer" .}}

templates/repo/header.tmpl

@@ -183,6 +183,15 @@
 					</a>
 				{{end}}
 
+				{{if and .EnableActions (not .UnitActionsGlobalDisabled) (.Permission.CanRead $.UnitTypeActions)}}
+					<a class="{{if .PageIsActions}}active {{end}}item" href="{{.RepoLink}}/actions">
+						{{svg "octicon-play"}} {{.locale.Tr "actions.actions"}}
+						{{if .Repository.NumOpenActionRuns}}
+							<span class="ui primary small label">{{CountFmt .Repository.NumOpenActionRuns}}</span>
+						{{end}}
+					</a>
+				{{end}}
+
 				{{if .Permission.CanRead $.UnitTypePackages}}
 					<a href="{{.RepoLink}}/packages" class="{{if .IsPackagesPage}}active {{end}}item">
 						{{svg "octicon-package"}} {{.locale.Tr "packages.title"}}

templates/repo/settings/navbar.tmpl

@@ -32,5 +32,10 @@
 				{{.locale.Tr "repo.settings.lfs"}}
 			</a>
 		{{end}}
+		{{if and .EnableActions (not .UnitActionsGlobalDisabled) (.Permission.CanRead $.UnitTypeActions)}}
+			<a class="{{if .PageIsSettingsRunners}}active {{end}}item" href="{{.RepoLink}}/settings/runners">
+				{{.locale.Tr "actions.runners"}}
+			</a>
+		{{end}}
 	</div>
 </div>

templates/repo/settings/options.tmpl

@@ -433,6 +433,21 @@
 					</div>
 				</div>
 
+				{{if .EnableActions}}
+					{{$isActionsEnabled := .Repository.UnitEnabled $.Context $.UnitTypeActions}}
+					<div class="inline field">
+						<label>{{.locale.Tr "actions.actions"}}</label>
+						{{if .UnitTypeActions.UnitGlobalDisabled}}
+							<div class="ui checkbox tooltip disabled" data-content="{{.locale.Tr "repo.unit_disabled"}}">
+						{{else}}
+							<div class="ui checkbox">
+						{{end}}
+							<input class="enable-system" name="enable_actions" type="checkbox" {{if $isActionsEnabled}}checked{{end}}>
+							<label>{{.locale.Tr "repo.settings.actions_desc"}}</label>
+						</div>
+					</div>
+				{{end}}
+
 				{{if not .IsMirror}}
 					<div class="ui divider"></div>
 					{{$pullRequestEnabled := .Repository.UnitEnabled $.Context $.UnitTypePullRequests}}

templates/repo/settings/runner_edit.tmpl

@@ -0,0 +1,9 @@
+{{template "base/head" .}}
+<div class="page-content repository settings runners">
+	{{template "repo/header" .}}
+	{{template "repo/settings/navbar" .}}
+	<div class="ui container">
+		{{template "shared/actions/runner_edit" .}}
+	</div>
+</div>
+{{template "base/footer" .}}

templates/repo/settings/runners.tmpl

@@ -0,0 +1,9 @@
+{{template "base/head" .}}
+<div class="page-content repository settings runners">
+	{{template "repo/header" .}}
+	{{template "repo/settings/navbar" .}}
+	<div class="ui container">
+		{{template "shared/actions/runner_list" .}}
+	</div>
+</div>
+{{template "base/footer" .}}