CI: Add automation for github assets publishing (#59491)

* Add github.star

# Conflicts:
#	.drone.star
#	.drone.yml

* Make step depend on fetch images

# Conflicts:
#	.drone.yml

* artifacts -> path

# Conflicts:
#	.drone.yml

* Add github token

# Conflicts:
#	.drone.yml

* Fix custom path

# Conflicts:
#	.drone.yml

* Add case where path is absent

# Conflicts:
#	.drone.yml

* Add GH_REGISTRY secret

# Conflicts:
#	.drone.yml

pkg/build/cmd/publishgithub.go

@@ -114,6 +114,10 @@ func getPublishGithubFlags(ctx *cli.Context) (*publishGithubFlags, error) {
 	name := strings.Split(fullRepo, "/")[1]
 	create := ctx.Value("create").(bool)
 	artifactPath := ctx.Value("path").(string)
+	if artifactPath == "" {
+		artifactPath = fmt.Sprintf("grafana-enterprise2-%s-amd64.img", metadata.GrafanaVersion)
+		fmt.Printf("path argument is not provided, resolving to default %s...\n", artifactPath)
+	}
 	return &publishGithubFlags{
 		artifactPath: artifactPath,
 		create:       create,