ci: add build docker

.github/workflows/build.yml

@@ -0,0 +1,49 @@
+name: Build docker
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - "**"
+    paths:
+      - ".github/workflows/build.yml"
+      - "src/**"
+      - "**.py"
+  pull_request:
+    branches:
+      - "**"
+    paths:
+      - ".github/workflows/build.yml"
+      - "src/**"
+      - "**.py"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install deps
+        run: python -m pip install -r requirements.txt
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io${{ env.REGISTRY }}/${{ github.repository }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: "ghcr.io/mirrorchyan/billing-backend:latest"
+          labels: ${{ steps.meta.outputs.labels }}