cmd, internal/build, docker: advertise commit date in unstable build versions (#19522)

* add-date-to unstable

* fields-insteadof-split

* internal/build: support building with missing git

* docker: add git history back to support commit date in version

* internal/build: use PR commits hashes for PR builds

cmd/utils/flags.go

@@ -92,16 +92,13 @@ GLOBAL OPTIONS:
 }
 
 // NewApp creates an app with sane defaults.
-func NewApp(gitCommit, usage string) *cli.App {
+func NewApp(gitCommit, gitDate, usage string) *cli.App {
 	app := cli.NewApp()
 	app.Name = filepath.Base(os.Args[0])
 	app.Author = ""
 	//app.Authors = nil
 	app.Email = ""
-	app.Version = params.VersionWithMeta
-	if len(gitCommit) >= 8 {
-		app.Version += "-" + gitCommit[:8]
-	}
+	app.Version = params.VersionWithCommit(gitCommit, gitDate)
 	app.Usage = usage
 	return app
 }