chore: add Dockerfile and Gitea Actions build workflow

.dockerignore

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+node_modules/
+dist/
+.env
+server/data/
+.git/
+.gitkeep
+*.md
+.gitignore
+docs/

.gitea/workflows/build.yml

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+name: Build & Push Docker Image
+run-name: Build ${{ gitea.ref_name }} by @${{ gitea.actor }}
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login Gitea Container Registry
+        run: echo "${{ secrets.GITEA_TOKEN }}" | docker login gitea.lokcal.de -u loki --password-stdin
+
+      - name: Build and tag
+        run: |
+          IMAGE="gitea.lokcal.de/loki/update-planer"
+          docker build \
+            --label "org.opencontainers.image.source=https://gitea.lokcal.de/loki/UpdatePlaner" \
+            --label "org.opencontainers.image.revision=${{ gitea.sha }}" \
+            -t "$IMAGE:${{ gitea.sha }}" \
+            -t "$IMAGE:latest" .
+
+      - name: Push
+        run: |
+          IMAGE="gitea.lokcal.de/loki/update-planer"
+          docker push "$IMAGE:${{ gitea.sha }}"
+          docker push "$IMAGE:latest"

Dockerfile

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+FROM node:22-slim AS build
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+FROM node:22-slim AS server-build
+WORKDIR /app
+COPY server/package*.json ./server/
+COPY server/tsconfig.json ./server/
+COPY server/src/ ./server/src/
+RUN cd server && npm ci && npx tsc
+
+FROM node:22-slim
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY --from=build /app/dist ./dist
+COPY --from=server-build /app/server/dist ./server/dist
+COPY --from=server-build /app/server/node_modules ./server/node_modules
+
+COPY .env.example ./.env.example
+
+EXPOSE 3001
+VOLUME ["/data"]
+
+ENV DATABASE_PATH=/data/app.db
+ENV NODE_ENV=production
+
+CMD ["node", "server/dist/index.js"]