Build: Use a most generig gp pipeline

Jenkinsfile

@@ -5,12 +5,16 @@
 // Initialize global config
 cfg = jplConfig('gp-php', 'docker', '', [email: env.CITEECKE_NOTIFY_EMAIL_TARGETS])
 
-def publishDockerImage() {
-    nextReleaseNumber = sh (script: "kd get-next-release-number .", returnStdout: true).trim().substring(1)
+def publishDockerImage(nextReleaseNumber = "") {
+    if (nextReleaseNumber == "") {
+        nextReleaseNumber = sh (script: "kd get-next-release-number .", returnStdout: true).trim().substring(1)
+    }
     docker.withRegistry("https://registry.hub.docker.com", 'teeckebot-docker-credentials') {
-        def customImage = docker.build("teecke/gp-php:${nextReleaseNumber}", "./webapp")
+        def customImage = docker.build("teecke/${cfg.projectName}:${nextReleaseNumber}", "--pull --no-cache webapp")
         customImage.push()
-        customImage.push('latest')
+        if (nextReleaseNumber != "beta") {
+            customImage.push('latest')
+        }
     }
 }
 
@@ -30,6 +34,14 @@ pipeline {
                 }
             }
         }
+        stage ('Build') {
+            agent { label 'docker' }
+            steps {
+                script {
+                    publishDockerImage("beta")
+                }
+            }
+        }
         stage ('Make release') {
             when { branch 'release/new' }
             steps {