Apply ARM64 support to PR build workflow from PR #34

Co-authored-by: roryeckel <16675082+roryeckel@users.noreply.github.com>

Author: Copilot

.github/workflows/docker-image-pr.yml

@@ -17,8 +17,16 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+      with:
+        platforms: arm64
+
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
+      with:
+        install: true
+        driver-opts: network=host
 
     - name: Log in to GitHub Container Registry
       uses: docker/login-action@v3
@@ -36,9 +44,10 @@ jobs:
           type=raw,value=pr-${{ github.event.number }}
 
     - name: Build and push Docker image
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: .
+        platforms: linux/amd64,linux/arm64
         push: true
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}