adds multi-arch builds for image (#115)

Signed-off-by: Chris Burns <[email protected]>

Author: ChrisJBurns

.github/workflows/docker-publish.yml

@@ -16,6 +16,12 @@ jobs:
       - name: Checkout
         uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392 # v3.6.0
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3.10.0
+
       - name: Login to GitHub Container Registry
         uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
         with:
@@ -28,6 +34,7 @@ jobs:
         with:
           context: .
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: |
             ghcr.io/${{ github.repository }}:latest
             ghcr.io/${{ github.repository }}:${{ github.ref_name }}