Test CI for just the linters job

.gitlab-ci.yml

@@ -4,7 +4,7 @@ services:
   - docker:dind
 
 variables:
-  CONTAINER_IMAGE: registry.gitlab.haskell.org/$CI_PROJECT_PATH
+  CONTAINER_IMAGE_BASE: registry.gitlab.haskell.org/ghc/ghc
   DOCKER_HOST: tcp://docker:2375
   DOCKER_DRIVER: overlay2
 
@@ -14,8 +14,9 @@ before_script:
 build:
   stage: build
   script:
+    - export CONTAINER_IMAGE=$CONTAINER_IMAGE_BASE/linters
     - docker pull $CONTAINER_IMAGE:latest || true
-    - docker build --cache-from $CONTAINER_IMAGE:latest --tag $CONTAINER_IMAGE:$CI_COMMIT_SHA --tag $CONTAINER_IMAGE:latest .
-      #- docker push $CONTAINER_IMAGE:$CI_COMMIT_SHA
-      #- docker push $CONTAINER_IMAGE:latest
+    - docker build --cache-from $CONTAINER_IMAGE:latest --tag $CONTAINER_IMAGE:$CI_COMMIT_SHA --tag $CONTAINER_IMAGE:latest linters/
+    - docker push $CONTAINER_IMAGE:$CI_COMMIT_SHA
+    - docker push $CONTAINER_IMAGE:latest