Fix cache permission error in Docker container

- Create cache directories AFTER copying standalone files
- Create both fetch-cache and images subdirectories
- Set proper ownership for nextjs user
- Fixes EACCES permission denied errors for prerender cache

Dockerfile

@@ -67,10 +67,6 @@ RUN adduser --system --uid 1001 nextjs
 # Copy the built application
 COPY --from=builder /app/public ./public
 
-# Set the correct permission for prerender cache
-RUN mkdir .next
-RUN chown nextjs:nodejs .next
-
 # Automatically leverage output traces to reduce image size
 # https://nextjs.org/docs/advanced-features/output-file-tracing
 # Copy standalone output (contains server.js and all dependencies)
@@ -79,6 +75,10 @@ RUN chown nextjs:nodejs .next
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 
+# Create cache directories with correct permissions AFTER copying standalone
+RUN mkdir -p .next/cache/fetch-cache .next/cache/images && \
+    chown -R nextjs:nodejs .next/cache
+
 # Copy Prisma files
 COPY --from=builder /app/prisma ./prisma
 COPY --from=builder /app/node_modules/.prisma ./node_modules/.prisma