Fixed Jenkinfiles to dockerhub pull

Jenkinsfile

@@ -31,21 +31,11 @@ pipeline {
     }
 
     agent {
-        dockerfile {
-            filename 'Dockerfile.jenkins'
-            // 'docker build' would normally copy the whole build-dir to the container, changing the
-            // docker build directory avoids that overhead
-            dir 'docker'
-            // Pass the uid and the gid of the current user (jenkins-user) to the Dockerfile, so a
-            // corresponding user can be added. This is needed to provide the jenkins user inside
-            // the container for the ssh-agent to work.
-            // Another way would be to simply map the passwd file, but would spoil additional information
-            // Also hand in the group id of kvm to allow using /dev/kvm.
-            additionalBuildArgs '--build-arg USER_ID=$(id -u) --build-arg GROUP_ID=$(id -g) --build-arg KVM_GROUP_ID=$(getent group kvm | cut -d: -f3)'
-            // Ensure that each executor has its own gradle cache to not affect other builds
-            // that run concurrently.
-            args '--device /dev/kvm:/dev/kvm -m=6.5G'
-            label useDebugLabelParameter('LimitedEmulator')
+         docker {
+            image 'catrobat/catrobat-android:stable'
+            args '--device /dev/kvm:/dev/kvm -v /var/local/container_shared/gradle_cache/$EXECUTOR_NUMBER:/home/user/.gradle -m=6.5G'
+            label 'LimitedEmulator'
+            alwaysPull true
         }
     }
 

Jenkinsfile.releaseAPK

@@ -2,20 +2,11 @@
 
 pipeline {
     agent {
-        dockerfile {
-            filename 'Dockerfile.jenkins'
-            // 'docker build' would normally copy the whole build-dir to the container, changing the
-            // docker build directory avoids that overhead
-            dir 'docker'
-            // Pass the uid and the gid of the current user (jenkins-user) to the Dockerfile, so a
-            // corresponding user can be added. This is needed to provide the jenkins user inside
-            // the container for the ssh-agent to work.
-            // Another way would be to simply map the passwd file, but would spoil additional information
-            // Also hand in the group id of kvm to allow using /dev/kvm.
-            additionalBuildArgs '--build-arg USER_ID=$(id -u) --build-arg GROUP_ID=$(id -g) --build-arg KVM_GROUP_ID=$(getent group kvm | cut -d: -f3)'
-            // Ensure that each executor has its own gradle cache to not affect other builds
-            // that run concurrently.
-            args '--device /dev/kvm:/dev/kvm'
+        docker {
+            image 'catrobat/catrobat-android:stable'
+            args '--device /dev/kvm:/dev/kvm -v /var/local/container_shared/gradle_cache/$EXECUTOR_NUMBER:/home/user/.gradle -m=6.5G'
+            label 'LimitedEmulator'
+            alwaysPull true
         }
     }