feat: Docker build for backend

Author: maamokun

.github/workflows/docker-backend.yml

@@ -0,0 +1,89 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-amd64:
+    runs-on: runs-on=${{ github.run_id }}/runner=4cpu-linux-x64
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push (AMD64)
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64
+          context: .
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository }}:latest-amd
+            ghcr.io/${{ github.repository }}:${{ github.sha }}-amd
+
+  build-arm64:
+    runs-on: runs-on=${{ github.run_id }}/runner=4cpu-linux-arm64
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push (ARM64)
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/arm64
+          context: .
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository }}:latest-arm
+            ghcr.io/${{ github.repository }}:${{ github.sha }}-arm
+
+  build-merge:
+    runs-on: ubuntu-latest
+
+    needs:
+      - build-amd64
+      - build-arm64
+
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Merge
+        run: |
+          docker buildx imagetools create -t ghcr.io/${{ github.repository }}:latest \
+              ghcr.io/${{ github.repository }}:latest-amd \
+              ghcr.io/${{ github.repository }}:latest-arm

backend.Dockerfile

@@ -0,0 +1,14 @@
+FROM oven/bun:1 AS base
+WORKDIR /app
+
+COPY . .
+
+RUN bun i
+RUN bun run build
+
+FROM debian:bookworm-slim
+WORKDIR /app
+
+COPY --from=base /app/apps/backend/bin ./
+
+CMD ["./bin"]