feat: add ARM Docker build

Author: oakbrad

.github/workflows/ci.yml

@@ -30,6 +30,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Log in to GHCR
         uses: docker/login-action@v3
         with:
@@ -42,6 +48,7 @@ jobs:
         with:
           context: .
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: |
             ghcr.io/${{ github.repository }}:latest
             ghcr.io/${{ github.repository }}:${{ github.sha }}