feat: add docker pipeline and preview fixes

Dockerfile

@@ -0,0 +1,30 @@
+ARG NODE_IMAGE=docker.m.daocloud.io/library/node:24-alpine
+
+FROM ${NODE_IMAGE}
+
+ENV NODE_ENV=production \
+    PORT=3000 \
+    APP_DB_PATH=/app/data/app.sqlite \
+    UPLOAD_DIR=/app/data/sources \
+    PREVIEW_MAX_BYTES=16777216
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev && npm cache clean --force
+
+COPY public ./public
+COPY src ./src
+COPY sql ./sql
+COPY README.md ./
+
+RUN mkdir -p /app/data/sources \
+    && chown -R node:node /app
+
+USER node
+
+VOLUME ["/app/data"]
+
+EXPOSE 3000
+
+CMD ["node", "src/server.js"]