adding

podcast-checklist/Dockerfile

@@ -0,0 +1,18 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package.json ./
+RUN npm install --production
+
+COPY server.js ./
+COPY public/ ./public/
+
+VOLUME ["/data"]
+
+ENV PORT=3000
+ENV DATA_FILE=/data/progress.json
+
+EXPOSE 3000
+
+CMD ["node", "server.js"]