maybe we have some image tagging now!

.gitlab-ci.yml

@@ -6,7 +6,8 @@ variables:
   DOCKER_TLS_CERTDIR: ""
 stages:
   - buildx
-  - deploy
+  - build
+  - push
 
 buildx:
   image: docker:19-git
@@ -24,9 +25,9 @@ buildx:
     - git clone git://github.com/docker/buildx ./docker-buildx
     - docker build --platform=local -o . ./docker-buildx
 
-deploy:
+build:
   image: docker:19
-  stage: deploy
+  stage: build
   services:
     - name: docker:19-dind
       command: ["--experimental"]
@@ -35,11 +36,41 @@ deploy:
     - mv buildx ~/.docker/cli-plugins/docker-buildx
     - docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
   variables:
-    IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+    IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
   script:
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
     - docker buildx create --use --name mybuilder
     - docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 --push -t $IMAGE_TAG .
-    - docker pull $IMAGE_TAG
-    - docker tag $IMAGE_TAG $CI_REGISTRY_IMAGE:latest
+
+Push latest:
+  variables:
+    # We are just playing with Docker here. 
+    # We do not need GitLab to clone the source code.
+    GIT_STRATEGY: none
+  stage: push
+  only:
+    # Only "main" should be tagged "latest"
+    - main
+  script:
+    # Because we have no guarantee that this job will be picked up by the same runner 
+    # that built the image in the previous step, we pull it again locally
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+    # Then we tag it "latest"
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME $CI_REGISTRY_IMAGE:latest
+    # Annnd we push it.
     - docker push $CI_REGISTRY_IMAGE:latest
+
+# Finally, the goal here is to Docker tag any Git tag
+# GitLab will start a new pipeline everytime a Git tag is created, which is pretty awesome
+Push tag:
+  variables:
+    # Again, we do not need the source code here. Just playing with Docker.
+    GIT_STRATEGY: none
+  stage: push
+  only:
+    # We want this job to be run on tags only.
+    - tags
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME