Add support for armv7 in the docker build

.github/workflows/publish.yml

@@ -31,6 +31,11 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
      
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm32v7/armhf, arm64v8/aarch64
+
       # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
       - name: Log in to the Container registry
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
@@ -59,6 +64,7 @@ jobs:
         uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
         with:
           context: .
+          platforms: linux/arm/v7,linux/arm64,linux/amd64
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.12-slim
+FROM --platform=$TARGETPLATFORM python:3.9-slim:3.12-slim
 LABEL org.opencontainers.image.source=https://github.com/mdiluz/matchy
 LABEL org.opencontainers.image.description="Matchy matches matchees"
 LABEL org.opencontainers.image.licenses=Unlicense