Use build stage lockfile in Docker runtime

Dockerfile

@@ -14,7 +14,7 @@ RUN apt-get update \
 	&& apt-get install -y --no-install-recommends ffmpeg \
 	&& rm -rf /var/lib/apt/lists/*
 
-COPY package.json bun.lock* ./
+COPY --from=build /app/package.json /app/bun.lock ./
 RUN bun install --production --ignore-scripts
 
 COPY --from=build /app/build ./build