ci(backend): add release job to backend-prod downstream pipeline

.gitlab-ci/backend.yml

@@ -18,6 +18,7 @@ stages:
   - compile
   - lint
   - test
+  - release
 
 default:
   image:
@@ -39,7 +40,7 @@ compile:
   artifacts:
     paths:
       - ${CI_PROJECT_DIR}/.stack-work/
-      - ${CI_PROJECT_DIR}/.stack/
+      - bin/
   cache: &backend-cache
 
 lint:
@@ -55,3 +56,18 @@ test:
   script:
     - make -- backend-test${PROD_BUILD}
   cache: *backend-cache
+
+container:
+  stage: release
+  image: ${IMAGE_BUILDER}
+  needs:
+    - compile
+    - lint
+    - test
+  script:
+    - IMAGE_TAG=`./.gitlab-ci/version.pl`
+    - buildah bud -t ${IMAGE_TAG} --volume ${CI_PROJECT_DIR}/bin/:/tmp/uniworx-bin --file docker/fradrive/Dockerfile
+    - buildah push --creds "${CI_REGISTRY_USER}:${CI_JOB_TOKEN}" ${IMAGE_TAG} ${CI_REGISTRY_IMAGE}/${IMAGE_TAG}
+  rules: # should be equivalent to *release-rules in .gitlab-ci.yml
+    - if: $CI_COMMIT_TAG =~ /^v[0-9\.]+$/
+    - if: $CI_COMMIT_TAG =~ /^v[0-9\.]+-test-.*$/