Revert "feat(ci): switch building to buildkit"

This reverts commit 03470ca4.

.gitlab-ci.yml

@@ -5,8 +5,6 @@
   - if: $CI_COMMIT_TAG =~ /^\d+[.]\d+[.]\d+$/ || $CI_COMMIT_TAG =~ /^\d+[.]\d+[.]\d+[-]\S+$/
     exists:
       - Dockerfile
-    variables:
-      IMAGE: $IMAGE_LATEST
 
 stages:
   - test
@@ -21,54 +19,34 @@ lint:
     - npm run lint -- --no-fix
 
 docker-push:
+  # Use the official docker image.
+  image: docker:latest
   stage: release
-  image:
-    name: moby/buildkit:v0.10.3-rootless
-    entrypoint: ["sh", "-c"]
   variables:
-    DOCKER_CONTEXT: .
-    DOCKERFILE_DIR: .
-    DOCKERFILE_NAME: "Dockerfile"
-    BUILDKIT_ARGS: ""
     # the name of the image without version
     AURA_IMAGE_NAME: "autoradio/dashboard"
-    IMAGE: "name=$AURA_IMAGE_NAME:unstable"
-    IMAGE_LATEST: "name=$AURA_IMAGE_NAME:$CI_COMMIT_TAG,$AURA_IMAGE_NAME:latest"
-    BUILD_CACHE: "$CI_REGISTRY_IMAGE/buildcache"
-    # Necessary for buildkit in docker build
-    BUILDKITD_FLAGS: "--oci-worker-no-process-sandbox"
-    # Also login and push to Docker hub
-    DOCKERHUB_USER: "$DOCKER_ID"
-    DOCKERHUB_PASSWORD: "$DOCKER_HUB_AUTH"
-  rules:
-    # Always tag with unstable, on release branch also tag with latest
+  services:
+    - docker:dind
+  before_script:
+    # default repo is docker.io (aka docker hub)
+    - docker login -u "$DOCKER_ID" -p "$DOCKER_HUB_AUTH"
+  script:
+    # every commit on main branch should build image as unstable
+    # else it is from a tag (enforced by gitlab-ci rules)
+    # hint: tags are references independent of branches
+    - |
+      if [ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]
+        then docker build -t $AURA_IMAGE_NAME:unstable .
+        else docker build -t $AURA_IMAGE_NAME -t $AURA_IMAGE_NAME:$CI_COMMIT_TAG .
+      fi
+    # TODO: maybe isolate docker build and docker push
+    - docker push "$AURA_IMAGE_NAME" --all-tags
+  rules: 
     - *release-rules
-    - if: "$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH"
+    # every commit on master/main branch should trigger a push to docker-hub as unstable without a release
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH 
       exists:
         - Dockerfile
-  before_script:
-    - mkdir -p ~/.docker
-    - >
-      echo "{ \"auths\": {
-              \"https://index.docker.io/v1/\": {
-                \"auth\": \"$(echo -n \"$DOCKERHUB_USER:$DOCKERHUB_PASSWORD\" | base64)\"
-              }
-            }}" >> ~/.docker/config.json
-  script:
-    - >
-      echo "Docker context: $DOCKER_CONTEXT"
-      && echo "Dockerfile directory: $DOCKERFILE_DIR"
-      && echo "Cache image: $BUILD_CACHE"
-      && echo "Images:" $(echo $IMAGE | sed "s/name=//")
-    - '[[ -n "$DOCKERFILE_NAME" ]] && BUILDKIT_ARGS="$BUILDKIT_ARGS --frontend-opt filename=$DOCKERFILE_NAME"'
-    - echo $BUILDKIT_ARGS
-    - >
-      buildctl-daemonless.sh build --progress=plain
-      --frontend=dockerfile.v0 --local context=$DOCKER_CONTEXT --local dockerfile=$DOCKERFILE_DIR
-      --export-cache type=registry,mode=max,ref=$BUILD_CACHE
-      --import-cache type=registry,ref=$BUILD_CACHE
-      --output type=image,\"$IMAGE\",push=true
-      $BUILDKIT_ARGS
 
 release_job:
   stage: release