feat: add build&push docker image action

* feat: add build&push docker image action

* fix file end line

.github/workflows/build-and-push-docker-image.yml

@@ -0,0 +1,31 @@
+name: build-and-push-docker-image
+
+on:
+  push:
+    branches:
+      - "main"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_NEOSMEMO_USERNAME }}
+          password: ${{ secrets.DOCKER_NEOSMEMO_TOKEN }}
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build and Push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Dockerfile
+          push: true
+          tags: ${{ secrets.DOCKER_NEOSMEMO_USERNAME }}/memos:latest