fix(ci): copy .npmrc before pnpm install in all Dockerfiles

The .npmrc file contains supportedArchitectures settings to force pnpm
to install glibc x64 binaries for native modules like matrix-sdk-crypto-nodejs.

Without copying this file into the Docker image, pnpm defaults to the
platform's native behavior which may skip or install incorrect binaries.

apps/orchestrator/Dockerfile

@@ -22,6 +22,9 @@ 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