add github actions

.github/workflows/docker_build_push.yml

@@ -0,0 +1,34 @@
+name: Build and Publish Docker
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build_and_push:
+    runs-on: ubuntu-latest
+    env:
+      IMAGE_NAME: rpxy
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Docker Hub
+        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: .
+          push: true
+          tags: |
+            ${{ secrets.DOCKERHUB_USERNAME }}/${{ env.IMAGE_NAME }}:latest
+          file: ./Dockerfile