Fix CI: resolve /app path and fix-base image issues

- Tests: symlink /app -> $GITHUB_WORKSPACE so Config paths resolve
- Docker: build fix-base locally first before dependent images
- Use direct docker build commands (simpler, no registry needed)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -27,7 +27,9 @@ jobs:
           pip install pytest
 
       - name: Run tests
-        run: pytest matcher/test_matcher.py -v
+        run: |
+          sudo ln -s $GITHUB_WORKSPACE /app
+          pytest matcher/test_matcher.py -v
 
   docker-build:
     name: Docker Build Check
@@ -37,23 +39,14 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+      - name: Build fix-base (local base image)
+        run: docker build -t fix-base -f Dockerfile.base .
 
       - name: Build frontend
-        uses: docker/build-push-action@v6
-        with:
-          context: ./frontend
-          push: false
+        run: docker build -t stockex-frontend ./frontend
 
       - name: Build matcher
-        uses: docker/build-push-action@v6
-        with:
-          context: ./matcher
-          push: false
+        run: docker build -t stockex-matcher ./matcher
 
       - name: Build dashboard
-        uses: docker/build-push-action@v6
-        with:
-          context: ./dashboard
-          push: false
+        run: docker build -t stockex-dashboard ./dashboard