Implement actions artifacts (#22738)

Implement action artifacts server api.

This change is used for supporting
https://github.com/actions/upload-artifact and
https://github.com/actions/download-artifact in gitea actions. It can
run sample workflow from doc
https://docs.github.com/en/actions/using-workflows/storing-workflow-data-as-artifacts.
The api design is inspired by
https://github.com/nektos/act/blob/master/pkg/artifacts/server.go and
includes some changes from gitea internal structs and methods.

Actions artifacts contains two parts:

- Gitea server api and storage (this pr implement basic design without
some complex cases supports)
- Runner communicate with gitea server api (in comming)

Old pr https://github.com/go-gitea/gitea/pull/22345 is outdated after
actions merged. I create new pr from main branch.


![897f7694-3e0f-4f7c-bb4b-9936624ead45](https://user-images.githubusercontent.com/2142787/219382371-eb3cf810-e4e0-456b-a8ff-aecc2b1a1032.jpeg)

Add artifacts list in actions workflow page.

models/repo.go

@@ -59,6 +59,12 @@ func DeleteRepository(doer *user_model.User, uid, repoID int64) error {
 		return fmt.Errorf("find actions tasks of repo %v: %w", repoID, err)
 	}
 
+	// Query the artifacts of this repo, they will be needed after they have been deleted to remove artifacts files in ObjectStorage
+	artifacts, err := actions_model.ListArtifactsByRepoID(ctx, repoID)
+	if err != nil {
+		return fmt.Errorf("list actions artifacts of repo %v: %w", repoID, err)
+	}
+
 	// In case is a organization.
 	org, err := user_model.GetUserByID(ctx, uid)
 	if err != nil {
@@ -164,6 +170,7 @@ func DeleteRepository(doer *user_model.User, uid, repoID int64) error {
 		&actions_model.ActionRunJob{RepoID: repoID},
 		&actions_model.ActionRun{RepoID: repoID},
 		&actions_model.ActionRunner{RepoID: repoID},
+		&actions_model.ActionArtifact{RepoID: repoID},
 	); err != nil {
 		return fmt.Errorf("deleteBeans: %w", err)
 	}
@@ -336,6 +343,14 @@ func DeleteRepository(doer *user_model.User, uid, repoID int64) error {
 		}
 	}
 
+	// delete actions artifacts in ObjectStorage after the repo have already been deleted
+	for _, art := range artifacts {
+		if err := storage.ActionsArtifacts.Delete(art.StoragePath); err != nil {
+			log.Error("remove artifact file %q: %v", art.StoragePath, err)
+			// go on
+		}
+	}
+
 	return nil
 }