fix: resolve Docker build syntax errors (#1996) (#1999)

* fix: resolve Docker build syntax errors and merge conflicts

- Fix incomplete ARG HuggingFace declaration to ARG HuggingFace_API_KEY
- Fix invalid WORKDIR variable reference ${WORKDIR}/run to /app/run
- Resolve merge conflicts preserving both runtime and development stages
- Add proper development stage with corrected environment variables
- Ensure both dockerbuild and dockerbuild:prod targets work correctly

Resolves Docker build error: "target stage 'bolt-ai-development' could not be found"

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

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

* ci: add comprehensive Docker build validation to main CI pipeline

- Add docker-validation job to ci.yaml workflow
- Test both runtime (production) and development Docker targets
- Validate docker-compose configuration syntax
- Run on all PRs and pushes to catch Docker build issues early
- Set 15-minute timeout to prevent hanging builds
- Use --no-cache and --progress=plain for reliable validation

This ensures Docker build syntax errors like #1996 are caught in CI
before they reach main branch, preventing deployment failures.

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

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

* fix: use modern docker compose command syntax in CI

- Change docker-compose to docker compose (GitHub Actions uses Docker Compose v2)
- Fixes CI failure: docker-compose: command not found
- Ensures docker-compose validation works in GitHub Actions runners

---------

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/ci.yaml

@@ -58,3 +58,33 @@ jobs:
           name: coverage-report
           path: coverage/
           retention-days: 7
+
+  docker-validation:
+    name: Docker Build Validation
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Validate Docker production build
+        run: |
+          echo "🐳 Testing Docker production target..."
+          docker build --target runtime . --no-cache --progress=plain
+          echo "✅ Production target builds successfully"
+
+      - name: Validate Docker development build
+        run: |
+          echo "🐳 Testing Docker development target..."
+          docker build --target development . --no-cache --progress=plain
+          echo "✅ Development target builds successfully"
+
+      - name: Validate docker-compose configuration
+        run: |
+          echo "🐳 Validating docker-compose configuration..."
+          docker compose config --quiet
+          echo "✅ docker-compose configuration is valid"