API method to list all commits of a repository (#6408)

* Added API endpoint ListAllCommits (/repos/{owner}/{repo}/git/commits)

Signed-off-by: Mike Schwörer <mailport@mikescher.de>

* Fixed failing drone build

Signed-off-by: Mike Schwörer <mailport@mikescher.de>

* Implemented requested changes (PR reviews)

Signed-off-by: Mike Schwörer <mailport@mikescher.de>

* gofmt

Signed-off-by: Mike Schwörer <mailport@mikescher.de>

* Changed api route from "/repos/{owner}/{repo}/git/commits" to "/repos/{owner}/{repo}/commits"

* Removed unnecessary line

* better error message when git repo is empty

* make generate-swagger

* fixed removed return

* Update routers/api/v1/repo/commits.go

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Update routers/api/v1/repo/commits.go

Co-Authored-By: Lauris BH <lauris@nix.lv>

* go fmt

* Refactored common code into ToCommit()

* made toCommit not exported

* added check for userCache == nil

routers/api/v1/swagger/repo.go

@@ -190,6 +190,35 @@ type swaggerCommit struct {
 	Body api.Commit `json:"body"`
 }
 
+// CommitList
+// swagger:response CommitList
+type swaggerCommitList struct {
+	// The current page
+	Page int `json:"X-Page"`
+
+	// Commits per page
+	PerPage int `json:"X-PerPage"`
+
+	// Total commit count
+	Total int `json:"X-Total"`
+
+	// Total number of pages
+	PageCount int `json:"X-PageCount"`
+
+	// True if there is another page
+	HasMore bool `json:"X-HasMore"`
+
+	//in: body
+	Body []api.Commit `json:"body"`
+}
+
+// EmptyRepository
+// swagger:response EmptyRepository
+type swaggerEmptyRepository struct {
+	//in: body
+	Body api.APIError `json:"body"`
+}
+
 // FileResponse
 // swagger:response FileResponse
 type swaggerFileResponse struct {