Improve Docker build caching for staging workflow

- Add registry cache persistence to fallback when GHA cache expires
- Optimize static-assets stage with selective COPY for frontend files
- Reduces context from 44MB to 3.2MB, preventing cache invalidation on backend changes
- Backend-only changes no longer trigger unnecessary frontend rebuilds

.github/workflows/coolify-staging-build.yml

@@ -80,7 +80,9 @@ jobs:
           cache-from: |
             type=gha,scope=build-${{ matrix.arch }}
             type=registry,ref=${{ env.GITHUB_REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache-${{ matrix.arch }}
-          cache-to: type=gha,mode=max,scope=build-${{ matrix.arch }}
+          cache-to: |
+            type=gha,mode=max,scope=build-${{ matrix.arch }}
+            type=registry,ref=${{ env.GITHUB_REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache-${{ matrix.arch }},mode=max
 
   merge-manifest:
     runs-on: ubuntu-24.04

docker/production/Dockerfile

@@ -38,10 +38,24 @@ USER www-data
 FROM node:24-alpine AS static-assets
 
 WORKDIR /app
-COPY package*.json vite.config.js postcss.config.cjs ./
+
+# Layer 1: Package dependencies (rarely changes)
+COPY package*.json ./
 RUN --mount=type=cache,target=/root/.npm \
     npm ci
-COPY . .
+
+# Layer 2: Build config (rarely changes)
+COPY vite.config.js postcss.config.cjs ./
+
+# Layer 3: Frontend source files
+COPY resources/css/ ./resources/css/
+COPY resources/js/ ./resources/js/
+COPY resources/fonts/ ./resources/fonts/
+
+# Layer 4: Blade templates for Tailwind class detection
+COPY resources/views/ ./resources/views/
+
+# Build frontend assets
 RUN npm run build
 
 # =================================================================