Support configuration variables on Gitea Actions (#24724)

Co-Author: @silverwind @wxiaoguang 
Replace: #24404

See:
- [defining configuration variables for multiple
workflows](https://docs.github.com/en/actions/learn-github-actions/variables#defining-configuration-variables-for-multiple-workflows)
- [vars
context](https://docs.github.com/en/actions/learn-github-actions/contexts#vars-context)

Related to:
- [x] protocol: https://gitea.com/gitea/actions-proto-def/pulls/7
- [x] act_runner: https://gitea.com/gitea/act_runner/pulls/157
- [x] act: https://gitea.com/gitea/act/pulls/43

#### Screenshoot
Create Variable:

![image](https://user-images.githubusercontent.com/33891828/236758288-032b7f64-44e7-48ea-b07d-de8b8b0e3729.png)


![image](https://user-images.githubusercontent.com/33891828/236758174-5203f64c-1d0e-4737-a5b0-62061dee86f8.png)

Workflow:
```yaml
  test_vars:
    runs-on: ubuntu-latest
    steps:
      - name: Print Custom Variables
        run: echo "${{ vars.test_key }}"
      - name: Try to print a non-exist var
        run: echo "${{ vars.NON_EXIST_VAR }}"
```

Actions Log:

![image](https://user-images.githubusercontent.com/33891828/236759075-af0c5950-368d-4758-a8ac-47a96e43b6e2.png)

---
This PR just implement the org / user (depends on the owner of the
current repository) and repo level variables, The Environment level
variables have not been implemented.
Because
[Environment](https://docs.github.com/en/actions/deployment/targeting-different-environments/using-environments-for-deployment#about-environments)
is a module separate from `Actions`. Maybe it would be better to create
a new PR to do it.

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

templates/user/settings/actions.tmpl

@@ -4,6 +4,8 @@
 		{{template "shared/secrets/add_list" .}}
 	{{else if eq .PageType "runners"}}
 		{{template "shared/actions/runner_list" .}}
+	{{else if eq .PageType "variables"}}
+		{{template "shared/variables/variable_list" .}}
 	{{end}}
 	</div>
 

templates/user/settings/navbar.tmpl

@@ -20,7 +20,7 @@
 			{{.locale.Tr "settings.ssh_gpg_keys"}}
 		</a>
 		{{if .EnableActions}}
-		<details class="item toggleable-item" {{if or .PageIsSharedSettingsRunners .PageIsSharedSettingsSecrets}}open{{end}}>
+		<details class="item toggleable-item" {{if or .PageIsSharedSettingsRunners .PageIsSharedSettingsSecrets .PageIsSharedSettingsVariables}}open{{end}}>
 			<summary>{{.locale.Tr "actions.actions"}}</summary>
 			<div class="menu">
 				<a class="{{if .PageIsSharedSettingsRunners}}active {{end}}item" href="{{AppSubUrl}}/user/settings/actions/runners">
@@ -29,6 +29,9 @@
 				<a class="{{if .PageIsSharedSettingsSecrets}}active {{end}}item" href="{{AppSubUrl}}/user/settings/actions/secrets">
 					{{.locale.Tr "secrets.secrets"}}
 				</a>
+				<a class="{{if .PageIsSharedSettingsVariables}}active {{end}}item" href="{{AppSubUrl}}/user/settings/actions/variables">
+					{{.locale.Tr "actions.variables"}}
+				</a>
 			</div>
 		</details>
 		{{end}}