add docker image

.changeset/yellow-brooms-sell.md

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+---
+"nostrudel": minor
+---
+
+Add docker image

.github/workflows/docker-image.yml

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+name: Create and publish a Docker image
+# copied from https://blog.pradumnasaraf.dev/publish-image-on-ghcr
+
+on:
+  push:
+    branches: ["master"]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          labels: ${{ steps.meta.outputs.labels }}

dockerfile

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+# syntax=docker/dockerfile:1
+FROM node:18
+WORKDIR /app
+COPY . /app/
+RUN yarn install && yarn build
+
+FROM nginx:stable-alpine-slim
+EXPOSE 80
+COPY --from=0 /app/dist /usr/share/nginx/html