feat(ci): Publish UI as lightweight container image

.dockerignore

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+node_modules
+dist
+.git
+.github
+.vscode
+.idea
+coverage
+*.log
+.env
+.env.*
+!.env.example
+Dockerfile
+.dockerignore

.github/workflows/docker-image.yml

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+name: Docker Image
+
+on:
+  push:
+    branches: [main]
+  release:
+    types: [published]
+
+jobs:
+  build:
+    name: Build & Push
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - 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.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/ui
+          tags: |
+            type=sha,format=short,enable=${{ github.event_name == 'push' }}
+            type=semver,pattern={{version}},enable=${{ github.event_name == 'release' }}
+            type=semver,pattern={{major}}.{{minor}},enable=${{ github.event_name == 'release' }}
+            type=raw,value=latest,enable=${{ github.event_name == 'release' && !github.event.release.prerelease }}
+          labels: |
+            org.opencontainers.image.title=FlatRun UI
+            org.opencontainers.image.description=Web interface for FlatRun container orchestration
+            org.opencontainers.image.vendor=FlatRun
+            org.opencontainers.image.licenses=MIT
+            org.opencontainers.image.documentation=https://github.com/${{ github.repository }}#readme
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          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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+# syntax=docker/dockerfile:1
+
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+
+LABEL org.opencontainers.image.title="FlatRun UI" \
+      org.opencontainers.image.description="Web interface for FlatRun container orchestration" \
+      org.opencontainers.image.vendor="FlatRun" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.source="https://github.com/flatrun/ui" \
+      org.opencontainers.image.url="https://github.com/flatrun/ui" \
+      org.opencontainers.image.documentation="https://github.com/flatrun/ui#readme"
+
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80

nginx.conf

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+server {
+    listen 80 default_server;
+    listen [::]:80 default_server;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    client_max_body_size 100M;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+        add_header Cache-Control "no-cache";
+    }
+
+    location /assets/ {
+        expires 30d;
+        add_header Cache-Control "public";
+    }
+}