CI: Allow other modules to register build sub-commands (#62741)

* Allow other modules to register build sub-commands

* CI: Fix retries on artifacts-page clone

* Fix linting errors

* Fix golint issues

* Update to grabpl 3.0.21

pkg/build/cmd/flags.go

@@ -52,4 +52,8 @@ var (
 		EnvVars: []string{"GITHUB_TOKEN"},
 		Usage:   "GitHub token",
 	}
+	tagFlag = cli.StringFlag{
+		Name:  "tag",
+		Usage: "Grafana version tag",
+	}
 )

pkg/build/cmd/main.go

@@ -10,6 +10,13 @@ import (
 	"github.com/grafana/grafana/pkg/build/docker"
 )
 
+var additionalCommands []*cli.Command = make([]*cli.Command, 0, 5)
+
+//nolint:unused
+func registerAppCommand(c *cli.Command) {
+	additionalCommands = append(additionalCommands, c)
+}
+
 func main() {
 	app := cli.NewApp()
 	app.Commands = cli.Commands{
@@ -280,10 +287,7 @@ func main() {
 							ArgsUsage: "[version]",
 							Action:    NpmReleaseAction,
 							Flags: []cli.Flag{
-								&cli.StringFlag{
-									Name:  "tag",
-									Usage: "Grafana version tag",
-								},
+								&tagFlag,
 							},
 						},
 						{
@@ -291,10 +295,7 @@ func main() {
 							Usage:  "Store npm packages tarball",
 							Action: NpmStoreAction,
 							Flags: []cli.Flag{
-								&cli.StringFlag{
-									Name:  "tag",
-									Usage: "Grafana version tag",
-								},
+								&tagFlag,
 							},
 						},
 						{
@@ -302,10 +303,7 @@ func main() {
 							Usage:  "Retrieve npm packages tarball",
 							Action: NpmRetrieveAction,
 							Flags: []cli.Flag{
-								&cli.StringFlag{
-									Name:  "tag",
-									Usage: "Grafana version tag",
-								},
+								&tagFlag,
 							},
 						},
 					},
@@ -417,6 +415,8 @@ func main() {
 		},
 	}
 
+	app.Commands = append(app.Commands, additionalCommands...)
+
 	if err := app.Run(os.Args); err != nil {
 		log.Fatalln(err)
 	}