Make actions URL in commit status webhooks absolute (#33620) (#33632)

Backport #33620 by lunny

Fix #33603

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/webhook/notifier.go

@@ -15,6 +15,7 @@ import (
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/httplib"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/repository"
 	"code.gitea.io/gitea/modules/setting"
@@ -875,6 +876,11 @@ func (m *webhookNotifier) CreateCommitStatus(ctx context.Context, repo *repo_mod
 		return
 	}
 
+	// as a webhook url, target should be an absolute url. But for internal actions target url
+	// the target url is a url path with no host and port to make it easy to be visited
+	// from multiple hosts. So we need to convert it to an absolute url here.
+	target := httplib.MakeAbsoluteURL(ctx, status.TargetURL)
+
 	payload := api.CommitStatusPayload{
 		Context:     status.Context,
 		CreatedAt:   status.CreatedUnix.AsTime().UTC(),
@@ -882,7 +888,7 @@ func (m *webhookNotifier) CreateCommitStatus(ctx context.Context, repo *repo_mod
 		ID:          status.ID,
 		SHA:         commit.Sha1,
 		State:       status.State.String(),
-		TargetURL:   status.TargetURL,
+		TargetURL:   target,
 
 		Commit: apiCommit,
 		Repo:   convert.ToRepo(ctx, repo, access_model.Permission{AccessMode: perm.AccessModeOwner}),