fix(kaniko): Allow repositories with port numbers to be used for caching

templates/gitlab-ci-docker.yml

@@ -416,7 +416,7 @@ stages:
 
   function run_build_kaniko() {
     docker_image=$1
-    kaniko_registry_repository=$(echo "$DOCKER_SNAPSHOT_IMAGE" | cut -d: -f1)
+    kaniko_registry_repository="${DOCKER_SNAPSHOT_IMAGE%:*}"
     shift
     if [[ -n "$DOCKER_REGISTRY_MIRROR" ]]
     then