add docker auto-build workflow

.github/workflows/docker.yml

@@ -0,0 +1,33 @@
+name: Build and Publish Docker
+
+on:
+  push:
+    branches:
+    - main
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: ./docker/
+          push: true
+          tags: dptechnology/unifold:pytorch1.11.0-cuda11.3-latest