cut '-SNAPSHOT' from image and helm tags

.gitlab-ci.yml

@@ -51,7 +51,7 @@ test-helm:
 
 .get-version:
   before_script:
-    - export PROJECT_VERSION=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout $MAVEN_CLI_OPTS)
+    - export PROJECT_VERSION=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout $MAVEN_CLI_OPTS | cut -d'-' -f1)
     - export PROJECT_ARTIFACTID=$(mvn help:evaluate -Dexpression=project.artifactId -q -DforceStdout $MAVEN_CLI_OPTS)
     - export NEXUS_IMAGE_PREFIX="docker.ozg-sh.de/${PROJECT_ARTIFACTID}"
     - export MERGE_REQUEST_TAG="${PROJECT_VERSION}-MR-${CI_MERGE_REQUEST_IID}"