add docker config

Dockerfile

@@ -0,0 +1,57 @@
+# Stage 1: Install dependencies (with build tools for native modules)
+FROM node:22-bookworm-slim AS deps
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    python3 make g++ \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Stage 2: Build the Next.js application
+FROM node:22-bookworm-slim AS builder
+WORKDIR /app
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+RUN npm run build
+
+# Stage 3: Production image
+FROM node:22-bookworm-slim AS runner
+WORKDIR /app
+
+# Install ffmpeg for video thumbnail generation
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV NODE_ENV=production
+ENV PORT=3000
+# Bind to all interfaces so the container port is reachable
+ENV HOSTNAME=0.0.0.0
+# Store libraries.json in /config so it can be bind-mounted as a directory.
+# Mounting a directory (not a single file) ensures the atomic rename in
+# writeLibraries() works — both .tmp and the target are on the same filesystem.
+ENV LIBRARIES_CONFIG_PATH=/config/libraries.json
+RUN mkdir -p /config
+
+# Copy standalone Next.js output
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
+# Copy native modules — Next.js standalone's file tracer does not follow
+# .node binary files, so we copy these manually from the deps stage.
+# Both are listed in serverExternalPackages and resolved at runtime via require().
+COPY --from=deps /app/node_modules/better-sqlite3 ./node_modules/better-sqlite3
+COPY --from=deps /app/node_modules/sharp ./node_modules/sharp
+COPY --from=deps /app/node_modules/@img ./node_modules/@img
+
+# Create thumbnail cache directory (mounted as a volume in production)
+RUN mkdir -p /app/.thumbnails
+
+EXPOSE 3000
+
+CMD ["node", "server.js"]