From 1911d5623cf65ed85dd533a926c98a85c45e48a8 Mon Sep 17 00:00:00 2001
From: Jose Selesan <jose.selesan@solotechnologies.us>
Date: Fri, 10 Apr 2026 15:50:46 -0300
Subject: [PATCH] perf(docker): optimize build with separate dependency stages
 for better layer caching

---
 apps/backend/Dockerfile | 38 ++++++++++++++++++++++++++++----------
 1 file changed, 28 insertions(+), 10 deletions(-)

diff --git a/apps/backend/Dockerfile b/apps/backend/Dockerfile
index ba6fcc3..e14cfc3 100644
--- a/apps/backend/Dockerfile
+++ b/apps/backend/Dockerfile
@@ -1,19 +1,29 @@
 # syntax=docker/dockerfile:1.7
 
-FROM oven/bun:1.3 AS deps
+# Stage 1: Install backend dependencies (cached unless backend deps change)
+FROM oven/bun:1.3 AS backend-deps
 WORKDIR /app
-
-# Workspace manifests first for better layer caching.
 COPY package.json ./
-COPY apps/backend/package.json apps/backend/package.json
-COPY apps/frontend/package.json apps/frontend/package.json
-COPY packages/api-contract/package.json packages/api-contract/package.json
+COPY apps/backend/package.json apps/backend/
+COPY packages/api-contract packages/api-contract/
+RUN bun install --frozen-lockfile
 
-RUN bun install
+# Stage 2: Install frontend dependencies (cached unless frontend deps change)
+FROM oven/bun:1.3 AS frontend-deps
+WORKDIR /app
+COPY package.json ./
+COPY apps/frontend/package.json apps/frontend/
+COPY packages/api-contract packages/api-contract/
+RUN bun install --frozen-lockfile
 
-FROM deps AS build
+# Stage 3: Build stage
+FROM backend-deps AS build
 WORKDIR /app
 
+# Copy frontend deps for building
+COPY --from=frontend-deps /app/node_modules ./frontend_node_modules
+
+# Copy source code
 COPY apps/backend apps/backend
 COPY apps/frontend apps/frontend
 COPY packages/api-contract packages/api-contract
@@ -30,10 +40,17 @@ ENV VITE_SUPABASE_ANON_KEY=${VITE_SUPABASE_ANON_KEY}
 ARG DATABASE_URL=postgresql://postgres:postgres@localhost:5432/postgres
 ENV DATABASE_URL=${DATABASE_URL}
 
-RUN bun --filter frontend build
+# Build frontend with its own node_modules
+RUN cp -R frontend_node_modules apps/frontend/node_modules
+RUN bun --cwd apps/frontend run build
+
+# Copy frontend build output to backend public folder
 RUN mkdir -p apps/backend/public && cp -R apps/frontend/dist/. apps/backend/public/
+
+# Generate Prisma client
 RUN bun --cwd apps/backend run prisma:generate
 
+# Stage 4: Runner
 FROM oven/bun:1.3-slim AS runner
 WORKDIR /app
 
@@ -41,7 +58,8 @@ ENV NODE_ENV=production
 ENV HOST=0.0.0.0
 ENV PORT=3000
 
-COPY --from=deps /app/node_modules ./node_modules
+# Copy only backend deps and built artifacts
+COPY --from=backend-deps /app/node_modules ./node_modules
 COPY --from=build /app/apps/backend ./apps/backend
 COPY --from=build /app/packages ./packages
 COPY package.json ./