Adds the Dockerfile and the pipeline

.github/workflows/docker-image.yml

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+# .github/workflows/docker-image.yml
+name: Docker Image CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/getting-started:latest
+            ghcr.io/${{ github.repository_owner }}/getting-started:${{ github.sha }}

.vscode/settings.json

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+{
+    "cSpell.words": [
+        "Buildx"
+    ]
+}

Dockerfile

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+FROM node:18-alpine
+WORKDIR /app
+COPY . .
+RUN yarn install --production && yarn cache clean
+ENTRYPOINT ["node"]
+CMD ["src/index.js"]
+EXPOSE 3000