Add workflow and push image

.github/workflows/create-image.yml

@@ -0,0 +1,41 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: "Build and push image"
+    env:
+        DOCKER_USER: ${{secrets.DOCKER_USERNAME}}
+        DOCKER_PASSWORD: ${{secrets.DOCKER_PASSWORD}}
+        ENV_FILE_CONTENT: ${{secrets.ENV_FILE_CONTENT}}
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Create .env file
+        run: echo "${{ env.ENV_FILE_CONTENT }}" > .env
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ env.DOCKER_USERNAME }}
+          password: ${{ env.DOCKER_PASSWORD }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: tiendat1011/DACN-Backend:latest
+          file: ./Dockerfile
+          build-args: 
+            ENV_FILE: .env