Remove platform from source images in Jenkinsfile

Jenkinsfile

@@ -48,10 +48,10 @@ pipeline {
               script {
                 stage("Build ${PLATFORM}") {
                   script {
-                    SOURCE_IMAGE = SOURCE+':'+PLATFORM.tokenize('/')[1]
+                    SOURCE_IMAGE = SOURCE
                     TARGET_IMAGE = TARGET+':'+PLATFORM.tokenize('/')[1]
                     if (env.BRANCH_NAME.startsWith('release/')) {
-                      SOURCE_IMAGE += "." + VERSION
+                      SOURCE_IMAGE += ":" + VERSION
                       TARGET_IMAGE += "." + VERSION
                     } else {
                       TARGET_IMAGE += VERSION