Initial release of WortKraft German A2/B1 learning studio

Dockerfile

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+FROM node:22-alpine
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=80
+ENV DATA_DIR=/app/data
+
+COPY package*.json ./
+RUN npm install --omit=dev
+
+COPY index.html styles.css app.js ./
+COPY data/ ./data/
+COPY server/ ./server/
+
+RUN mkdir -p /app/data
+
+EXPOSE 80
+
+HEALTHCHECK --interval=15s --timeout=5s --start-period=5s --retries=3 \
+  CMD wget --quiet --tries=1 --spider http://127.0.0.1:80/api/health || exit 1
+
+CMD ["node", "server/index.js"]