ci: add Docker build and GHCR publishing workflow

- Add Dockerfile with Node.js 18 Alpine base image
- Add .dockerignore to exclude unnecessary files
- Add GitHub Actions workflow for multi-platform Docker builds
- Support automatic image tagging on main branch and version tags
- Publish images to GitHub Container Registry (ghcr.io)

Author: bobo334

.dockerignore

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+node_modules
+npm-debug.log*
+.env
+.git
+.gitignore
+README.md
+LICENSE
+.vscode
+.idea
+*.md
+scripts/
+test-assets/

.github/workflows/docker.yml

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+name: Build and Push Docker Image to GHCR
+
+on:
+  push:
+    branches: [main]
+    tags: ['v*']
+  pull_request:
+    branches: [main]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

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+FROM node:18-alpine
+
+LABEL maintainer="bobotechnology"
+LABEL description="Fitten Code to OpenAI API Proxy"
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm install --production
+
+COPY . .
+
+EXPOSE 3000
+
+ENV NODE_ENV=production
+ENV PORT=3000
+
+CMD ["node", "index.js"]