Build amd64 and arm64 images concurrently

arm64 takes ~3x as long

.github/workflows/main.yml

@@ -8,12 +8,19 @@ on:
 
 jobs:
   docker:
+    strategy:
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
+        with:
+          platforms: ${{ matrix.platform }}
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Login to GitHub Container Registry
@@ -26,6 +33,7 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
-          platforms: linux/amd64,linux/arm64
+          platforms: ${{ matrix.platform }}
+          provenance: false
           push: true
           tags: ghcr.io/iublibtech/rdc/rdc:latest