chore: force cache invalidation with RUN before COPY

Dockerfile

@@ -1,5 +1,5 @@
 FROM node:20-alpine AS builder
-# cache-bust-v2
+# cache-bust-v3
 WORKDIR /app
 
 ENV NODE_ENV=development
@@ -9,6 +9,7 @@ COPY packages/shared/package.json ./packages/shared/
 COPY packages/db/package.json ./packages/db/
 RUN npm install
 
+RUN echo "bust-20260415-3" > /tmp/.cachebust && rm /tmp/.cachebust
 COPY packages/shared/ ./packages/shared/
 COPY packages/db/ ./packages/db/
 COPY nest-cli.json ./