Add Docker build/push job

.github/workflows/ci.yml

@@ -133,3 +133,34 @@ jobs:
       run: |
         ./test/qemu.sh $RUNNER_TEMP/boot-qemu_x86_virt.bin.gz \
                        $RUNNER_TEMP/${{ matrix.os }}-${{ matrix.suite }}-${{ matrix.arch }}-*.bin.gz
+
+  deploy-docker:
+    runs-on: ubuntu-latest
+    needs: test-debian-x86
+    name: deploy docker images
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login
+        if: github.event_name != 'pull_request' && github.ref_name == 'master'
+        uses: docker/login-action@v1
+        with:
+          registry: public.ecr.aws/johang
+          username: AWS
+          password: ${{ secrets.AWS_ECR_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' && github.ref_name == 'master' }}
+          tags: public.ecr.aws/johang/sd-card-images:latest