fix: resolve GitHub Actions workflow failures

## Fixed dependency updater workflow
- Added explicit workspace directory handling
- Improved error handling with clear error messages
- Fixed update summary file reading with error suppression
- Added error output for debugging failures

## Fixed Docker build workflow
- Added memory constraints (8GB/16GB swap) to prevent OOM
- Fixed Dockerfile to use npm scripts instead of direct node execution
- Added fallback mechanism: optimized rebuild → regular rebuild → error
- Added buildx ID reference and no-cache filter for db-builder stage

These changes should resolve both workflow failures and make the CI/CD pipeline more robust.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/docker-build.yml

@@ -32,7 +32,12 @@ jobs:
         uses: docker/setup-qemu-action@v3
         
       - name: Set up Docker Buildx
+        id: buildx
         uses: docker/setup-buildx-action@v3
+        with:
+          driver-opts: |
+            memory=8g
+            memory-swap=16g
         
       - name: Log in to GitHub Container Registry
         if: github.event_name != 'pull_request'
@@ -69,6 +74,9 @@ jobs:
           build-args: |
             BUILDKIT_INLINE_CACHE=1
           provenance: false
+          # Add build constraints to prevent OOM
+          builder: ${{ steps.buildx.outputs.name }}
+          no-cache-filters: db-builder
 
   # Nginx build commented out until Phase 2
   # build-nginx: