add github workflow

.github/workflows/build-image.yml

@@ -0,0 +1,31 @@
+name: Build image
+on:
+  push:
+    branches: ["main"]
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Docker Setup Buildx
+        uses: docker/setup-buildx-action@v2.2.1
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: "ghcr.io/${{ github.repository }}/main:latest"