ci: enable Kaniko layer caching for docker builds

.npmrc

@@ -1,3 +1 @@
 @mosaicstack:registry=https://git.mosaicstack.dev/api/packages/mosaic/npm/
-supportedArchitectures[libc][]=glibc
-supportedArchitectures[cpu][]=x64

apps/api/Dockerfile

@@ -30,9 +30,6 @@ COPY packages/ui/package.json ./packages/ui/
 COPY packages/config/package.json ./packages/config/
 COPY apps/api/package.json ./apps/api/
 
-# Copy npm configuration for native binary architecture hints
-COPY .npmrc ./
-
 # Install dependencies (no cache mount — Kaniko builds are ephemeral in CI)
 # Then explicitly rebuild node-pty from source since pnpm may skip postinstall
 # scripts or fail to find prebuilt binaries for this Node.js version

apps/orchestrator/Dockerfile

@@ -22,9 +22,6 @@ COPY packages/shared/package.json ./packages/shared/
 COPY packages/config/package.json ./packages/config/
 COPY apps/orchestrator/package.json ./apps/orchestrator/
 
-# Copy npm configuration for native binary architecture hints
-COPY .npmrc ./
-
 # Install ALL dependencies (not just production)
 # No cache mount — Kaniko builds are ephemeral in CI
 RUN pnpm install --frozen-lockfile

apps/web/Dockerfile

@@ -24,9 +24,6 @@ COPY packages/ui/package.json ./packages/ui/
 COPY packages/config/package.json ./packages/config/
 COPY apps/web/package.json ./apps/web/
 
-# Copy npm configuration for native binary architecture hints
-COPY .npmrc ./
-
 # Install dependencies (no cache mount — Kaniko builds are ephemeral in CI)
 RUN pnpm install --frozen-lockfile
 
@@ -41,9 +38,6 @@ COPY packages/ui/package.json ./packages/ui/
 COPY packages/config/package.json ./packages/config/
 COPY apps/web/package.json ./apps/web/
 
-# Copy npm configuration for native binary architecture hints
-COPY .npmrc ./
-
 # Install production dependencies only
 RUN pnpm install --frozen-lockfile --prod