Remove cache from docker jobs. Split devlop and stable branches into their own jobs

.gitlab-ci.yml

@@ -6,10 +6,6 @@ variables: &global_variables
   POSTGRES_PASSWORD: postgres
   DB_HOST: postgres
   MIX_ENV: test
-  DOCKER_DRIVER: overlay2
-  DOCKER_HOST: unix:///var/run/docker.sock
-  DOCKER_IMAGE: $CI_REGISTRY_IMAGE:latest
-  DOCKER_IMAGE_SHA: $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA
 
 cache: &global_cache_policy
   key: ${CI_COMMIT_REF_SLUG}
@@ -274,16 +270,43 @@ arm64-musl:
 docker:
   stage: docker
   image: docker:latest
-  tags:
-    - dind
+  cache: {}
+  variables: &docker-variables
+    DOCKER_DRIVER: overlay2
+    DOCKER_HOST: unix:///var/run/docker.sock
+    IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA
+    IMAGE_TAG_SLUG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+    IMAGE_TAG_LATEST: $CI_REGISTRY_IMAGE:latest
+    IMAGE_TAG_LATEST_STABLE: $CI_REGISTRY_IMAGE:latest-stable
   before_script: &before-docker
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
     - export CI_JOB_TIMESTAMP=$(date --utc -Iseconds)
     - export CI_VCS_REF=$CI_COMMIT_SHORT_SHA
   script:
-    - docker pull $DOCKER_IMAGE || true
-    - docker build --cache-from $DOCKER_IMAGE --build-arg VCS_REF=$CI_VCS_REF --build-arg BUILD_DATE=$CI_JOB_TIMESTAMP -t $DOCKER_IMAGE_SHA -t $DOCKER_IMAGE .
-    - docker push $DOCKER_IMAGE_SHA
-    - docker push $DOCKER_IMAGE
+    - docker pull $IMAGE_TAG_SLUG || true
+    - docker build --cache-from $IMAGE_TAG_SLUG --build-arg VCS_REF=$CI_VCS_REF --build-arg                       BUILD_DATE=$CI_JOB_TIMESTAMP -t $IMAGE_TAG -t $IMAGE_TAG_SLUG -t $IMAGE_TAG_LATEST .
+    - docker push $IMAGE_TAG
+    - docker push $IMAGE_TAG_SLUG
+    - docker push $IMAGE_TAG_LATEST
+  tags:
+    - dind
   only:
     - develop
+    - features/docker-updates
+
+docker-stable:
+  stage: docker
+  image: docker:latest
+  cache: {}
+  variables: *docker-variables
+  before_script: *before-docker
+  script:
+    - docker pull $IMAGE_TAG_SLUG || true
+    - docker build --cache-from $IMAGE_TAG_SLUG --build-arg VCS_REF=$CI_VCS_REF --build-arg                               BUILD_DATE=$CI_JOB_TIMESTAMP -t $IMAGE_TAG -t $IMAGE_TAG_SLUG -t $IMAGE_TAG_LATEST_STABLE .
+    - docker push $IMAGE_TAG
+    - docker push $IMAGE_TAG_SLUG
+    - docker push $IMAGE_TAG_LATEST_STABLE
+  tags:
+    - dind
+  only:
+    - stable