feat(standard-make): set MKT_PROJECT_VERSION_BRANCH_NAME value by default

vars/standardMakePipeline.groovy

@@ -34,6 +34,12 @@ void call(Map options = [:]) {
             buildDiscarder(logRotator(daysToKeepStr: jobHistory, numToKeepStr: jobHistory)),
         ])
 
+        environment {
+            // Set MKT_PROJECT_VERSION_BRANCH_NAME to Jenkins current branch name by default
+            // See https://forge.cadoles.com/Cadoles/mktools project
+            MKT_PROJECT_VERSION_BRANCH_NAME = env.BRANCH_NAME
+        }
+
         stage('Cancel older jobs') {
             int buildNumber = env.BUILD_NUMBER as int
             if (buildNumber > 1) {