Fix compilazione beta

Jenkinsfile.groovy

@@ -16,9 +16,20 @@ pipeline {
 
     stages {
 
+        stage('Preparing') {
+            when {
+                expression {
+                    return env.GIT_BRANCH == "master-beta"
+                }
+            }
+            steps {
+                bat "./gradlew addBetaSuffix"
+            }
+        }
+
         stage('Build') {
             steps {
-                bat "./gradlew addBetaSuffix assembleRelease"
+                bat "./gradlew assembleRelease"
                 archiveArtifacts artifacts: 'app/build/outputs/apk/release/', onlyIfSuccessful: true
             }
         }