ci(gitlab): prepare for building on tag refs

build and tag docker images on tags with tag ref instead of commit hash

.gitlab-ci.yml

@@ -40,15 +40,17 @@ build container image:
     name: gcr.io/kaniko-project/executor:debug
     entrypoint: [""]
   script:
+    - "[[ -n $CI_COMMIT_TAG ]] && export version=$CI_COMMIT_TAG || export version=$CI_COMMIT_SHORT_SHA"
     - mkdir -p /kaniko/.docker
     - echo "{\"auths\":{\"$CI_REGISTRY\":{\"auth\":\"$(echo -n ${CI_REGISTRY_USER}:${CI_REGISTRY_PASSWORD} | base64 | tr -d '\n')\"},\"$harbor_registry\":{\"auth\":\"$HARBOR_ROBOT_TOKEN64\"}}}" > /kaniko/.docker/config.json
     - /kaniko/executor
       --context $CI_PROJECT_DIR
       --dockerfile $CI_PROJECT_DIR/Dockerfile
       --build-arg build_date=$(date -u +'%Y-%m-%dT%H:%M:%SZ')
-      --build-arg vcs_ref=${CI_COMMIT_SHORT_SHA}
-      --build-arg version=${CI_COMMIT_SHORT_SHA}
-      --destination $CI_REGISTRY_IMAGE/repdav:$CI_COMMIT_SHORT_SHA
-      --destination $harbor_registry/$harbor_repo/repdav:$CI_COMMIT_SHORT_SHA
+      --build-arg vcs_ref=${version}
+      --build-arg version=${version}
+      --destination $CI_REGISTRY_IMAGE/repdav:$version
+      --destination $harbor_registry/$harbor_repo/repdav:$version
   rules:
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+    - if: $CI_COMMIT_TAG