Test buildx addition to multistage docker build action

.github/workflows/buildImage.yml

@@ -9,6 +9,7 @@ on:
 
 env: 
   REGISTRY: ghcr.io
+  DOCKER_BUILDKIT: "1"
 
 jobs:
   build-image:
@@ -31,13 +32,13 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       # use the multistage docker build action instead of docker's action
-      - uses: firehed/multistage-docker-build-action@v1
+      - uses: firehed/multistage-docker-build-action@bc95fc29c4849d83e8473c7644900f559391d39c
         id: build
         with:
           context: .
+          quiet: false
           repository: ${{ env.REGISTRY }}/${{ github.repository }}/learn-maintenance-image-${{ matrix.python-version }}
           tag-latest-on-default: true
-          stages: stage1, stage2
-          server-stage: stage3
-          build-args: |
-            PY_VERSION=${{ matrix.python-version }}
+          stages: stage1, stage3a
+          server-stage: stage3b
+          build-args: PY_VERSION=${{ matrix.python-version }}, MESSAGE="workflow"

Dockerfile

@@ -1,16 +1,26 @@
 ARG PY_VERSION=3.8
+ARG MESSAGE="default messsage"
 # syntax=docker/dockerfile:1
 
 FROM python:$PY_VERSION AS stage1
+ARG MESSAGE
 WORKDIR /app
 COPY requirements.txt requirements.txt
 RUN pip install -r requirements.txt
-RUN echo stage1
+RUN echo stage1 MESSAGE = ${MESSAGE}
 
-FROM stage1 AS stage2
+FROM stage1 AS stage2a
+RUN echo stage2a MESSAGE = ${MESSAGE}
+
+FROM stage2a AS stage2b
+RUN echo stage2b MESSAGE = ${MESSAGE}
+
+FROM stage1 AS stage3a
 RUN pip install numpy
-RUN echo stage2
+RUN echo stage3a MESSAGE = ${MESSAGE}
 
-FROM stage2 AS stage3
+FROM stage3a AS stage3b
 RUN pip install -U pytest coverage
 COPY . .
+RUN echo stage3b MESSAGE = ${MESSAGE}
+RUN echo something