Fix Dockerfile: copy prisma.config.ts into runtime image (needed for migrate deploy)

Dockerfile

@@ -19,6 +19,7 @@ COPY --from=builder /app/.next ./.next
 COPY --from=builder /app/public ./public
 COPY --from=builder /app/package.json ./package.json
 COPY --from=builder /app/next.config.ts ./next.config.ts
+COPY --from=builder /app/prisma.config.ts ./prisma.config.ts
 COPY --from=builder /app/prisma ./prisma
 COPY docker-entrypoint.sh ./docker-entrypoint.sh
 RUN chmod +x ./docker-entrypoint.sh