Update Dockerfile

Dockerfile

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 # Use official Node.js image as base
 # Next.js 16 requires Node 18.17+ or Node 20+
 # Using node:20-alpine for better compatibility with Next.js 16 and Turbopack
@@ -7,17 +9,22 @@ WORKDIR /app
 # Install git early for commit hash
 RUN apk add --no-cache git
 
-# Install pnpm
+# Install pnpm with cache mount for better performance
 RUN npm install -g pnpm
 
+# Copy package files for dependency installation
 COPY package.json pnpm-lock.yaml ./
 
-# Install dependencies with pnpm
-RUN pnpm install --frozen-lockfile
+# Install dependencies with pnpm cache mount for faster builds
+RUN --mount=type=cache,id=pnpm,target=/root/.local/share/pnpm \
+    --mount=type=cache,id=node_modules,target=/app/node_modules \
+    pnpm install --frozen-lockfile
 
+# Copy source code after dependencies are installed (for better caching)
 COPY . .
 
 # Get commit hash (fallback to "unknown" if not in git repo)
+# This is done after copying source to avoid cache invalidation
 RUN git rev-parse --short HEAD > /app/git_commit_sha 2>/dev/null || echo "unknown" > /app/git_commit_sha
 
 ENV NEXT_PUBLIC_API_URL=/api
@@ -27,7 +34,8 @@ ENV API_HOSTNAME=internal-api.inboxi.ng
 
 # Build the Next.js application with increased memory for Turbopack
 # Next.js 16 uses Turbopack by default which may need more memory
-RUN echo "Building with GIT_COMMIT_SHA=$(cat /app/git_commit_sha)" && \
+RUN --mount=type=cache,id=nextjs,target=/app/.next/cache \
+    echo "Building with GIT_COMMIT_SHA=$(cat /app/git_commit_sha)" && \
     NODE_OPTIONS='--max_old_space_size=4096' NEXT_TELEMETRY_DISABLED=1 pnpm run build
 
 # ---- Production Stage ----