try to speed up multi-arch docker builds by limiting qemu vm's to amd and arm only.

.github/workflows/docker-build.yaml

@@ -25,6 +25,8 @@ jobs:
           fetch-depth: 0
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
+        with:
+          platforms: 'arm64,arm'
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
       # Login against a Docker registry except on PR
@@ -74,6 +76,8 @@ jobs:
         uses: actions/checkout@v2
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
+        with:
+          platforms: 'arm64,arm'
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
       # Login against a Docker registry except on PR
@@ -123,6 +127,8 @@ jobs:
         uses: actions/checkout@v2
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
+        with:
+          platforms: 'arm64,arm'
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
       # Login against a Docker registry except on PR