added multi architecture build and push in 1 runner (simple to do, bu…

…t time consuming)

.github/workflows/docker-build-and-publish.yml

@@ -21,6 +21,12 @@ jobs:
       - name: Check out the repo
         uses: actions/checkout@v4
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Log in to Docker Hub
         uses: docker/[email protected]
         with:
@@ -38,6 +44,7 @@ jobs:
         with:
           context: .
           file: ./Dockerfile
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

CONTRIBUTING.md

@@ -18,5 +18,12 @@ Although it's possible to build packages without `dockerd` running, using [`buil
 2. Run the build command: `docker buildx build -t galette-local .`
     * replace `galette-local` with any name you would like to give your local image
 
+### Building for multiple architecures locally
+1. Start the docker daemon if it's not already started: `sudo dockerd`
+2. Create a builder-image `docker buildx create --name mybuilder --use --bootstrap` (see "Building with Buildx" [here](https://www.docker.com/blog/how-to-rapidly-build-multi-architecture-images-with-buildx/) for more details)
+3. Run the build command: `docker buildx build --platform linux/amd64,linux/arm64 -t galette-local .`
+    * replace `galette-local` with any name you would like to give your local image
+    * NOTE: The build process is significantly longer than just building for your local architecture.
+
 ## Running the docker image locally
 1. Follow the same steps as in [How to use this image](./README.md#How-to-use-this-image), replacing the image name `galette/galette:latest` with your local container name, e.g. `galette-local`.