Add Dockerfile, nginx config, and Gitea Actions CI workflow

.dockerignore

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+node_modules
+dist
+.git
+.gitignore
+*.md
+eslint.config.js
+vite.config.js

.gitea/workflows/docker.yml

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+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  REGISTRY: git.danhenry.dev
+  IMAGE_NAME: git.danhenry.dev/thelab/work-queue-webui
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKER_REGISTRY_USER }}
+          password: ${{ secrets.DOCKER_REGISTRY_TOKEN }}
+
+      - name: Extract commit SHA
+        run: echo "SHA=${GITEA_SHA:0:7}" >> $GITHUB_ENV
+
+      - name: Build and push multi-arch image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            ${{ env.IMAGE_NAME }}:${{ env.SHA }}
+            ${{ env.IMAGE_NAME }}:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

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+# Stage 1: Build the React app
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+# Stage 2: Serve with nginx
+FROM nginx:alpine
+
+COPY --from=builder /app/dist /usr/share/nginx/html
+COPY --from=builder /app/docker/nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80 443
+
+CMD ["nginx", "-g", "daemon off;"]

docker/nginx.conf

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+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}