Update GitHub Actions workflow for pipeline generator

- Set the working directory for installing dependencies and running tests to 'tools/pipeline-generator' to ensure correct execution context.
- This change enhances the workflow's reliability by explicitly defining the directory for the pipeline generator.

Signed-off-by: Victor Chang <[email protected]>

Author: mocsharp

.github/workflows/pr.yml

@@ -67,8 +67,10 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
       - name: Install dependencies
+        working-directory: tools/pipeline-generator
         run: |
           uv sync
       - name: Run tests
+        working-directory: tools/pipeline-generator
         run: |
           uv run pytest