Attempt separate build for ARM64. Support for OSX.

.github/workflows/build-devbox.yaml

@@ -11,7 +11,7 @@ env:
   IMAGE_NAME: ${{ github.repository }}
 
 jobs:
-  docker:
+  docker-amd64:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -46,3 +46,38 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+  docker-arm64:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+            submodules: recursive
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Extract version and branch metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=tag
+            type=raw,value=devcontainer
+            type=sha
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GHCR
+        uses: docker/#-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./.devcontainer/Dockerfile
+          platforms: linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}