feat(standard-make): add staging and master to default release branches

vars/standardMakePipeline.groovy

@@ -27,7 +27,7 @@ void call(Map options = [:]) {
     String dockerfileExtension = options.get('dockerfileExtension', '')
     List credentials = options.get('credentials', [])
 
-    List<String> releaseBranches = options.get('releaseBranches', ['develop', 'testing', 'stable'])
+    List<String> releaseBranches = options.get('releaseBranches', ['develop', 'testing', 'stable', 'staging', 'master'])
 
     node {
         properties([

vars/utils.groovy

@@ -52,8 +52,10 @@ String getProjectVersionShortChannel(String channel) {
         case 'develop':
             return 'dev'
         case 'testing':
+        case 'staging':
             return 'tst'
         case 'stable':
+        case 'master':
             return 'stb'
         default:
             return channel.toLowerCase().replaceAll('(a|e|i|o|u|y_|-| )+', '').take(3)