fix: Add PYTHONPATH to GitHub Actions workflows

Author: shlok926

.github/workflows/python-app.yml

@@ -26,5 +26,7 @@ jobs:
         pip install pytest
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Test with pytest
+      env:
+        PYTHONPATH: .
       run: |
         pytest tests/

.github/workflows/q_refine_benchmark.yml

@@ -24,6 +24,8 @@ jobs:
         pip install qiskit qiskit-aer matplotlib numpy
         
     - name: Run Q-Refine Enterprise Pipeline
+      env:
+        PYTHONPATH: .
       run: |
         python q_refine_pipeline.py