fix: Switch CI to DAG

.gitlab-ci.yml

@@ -1,8 +1,3 @@
-stages:
-  - prebuild_and_test
-  - tag
-  - push_image
-
 cache:
   paths:
     - _build
@@ -16,40 +11,31 @@ variables:
   DOCKER_TLS_CERTDIR: "/certs"
   DOCKER_HOST: tcp://docker:2376
 
-prebuild:
-  stage: prebuild_and_test
-  image: docker:19.03.12
-  services:
-  - name: docker:19.03.12-dind
-  script:
-    - docker login "https://${CI_REGISTRY}" -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
-    - docker pull $CI_REGISTRY_IMAGE:latest || true
-    - docker build --cache-from $CI_REGISTRY_IMAGE:latest -t $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA .
-    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
-
 test:
-  stage: prebuild_and_test
+  needs: []
   image: "elixir:1.10"
   services:
   - name: postgres:12
   script: script/cibuild
 
 deploy_to_tags:
-  stage: tag
+  needs: ['test']
   image: "node:15.0"
   script:
     - npm install
     - npx semantic-release
 
 deploy_to_registry:
-  stage: push_image
+  needs: ['test']
   image: "docker:19.03.12"
   services:
     - name: docker:19.03.12-dind
   only:
     - tags
   script:
-    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker login "https://${CI_REGISTRY}" -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
+    - docker pull $CI_REGISTRY_IMAGE:latest || true
+    - docker build --cache-from $CI_REGISTRY_IMAGE:latest -t $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA .
     - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
     - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:latest
     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG