Set PYTHONPATH environment variable for test execution in workflows

.github/workflows/build_v2.yml

@@ -27,6 +27,8 @@ jobs:
           python -m pip install --upgrade pip
           pip install pytest
       - name: Run tests
+        env:
+          PYTHONPATH: ${{ github.workspace }}
         run: pytest
 
   build:

.github/workflows/unit-tests.yml

@@ -27,6 +27,8 @@ jobs:
           python -m pip install pytest
 
       - name: Run tests
+        env:
+          PYTHONPATH: ${{ github.workspace }}
         run: |
           set -euo pipefail
           . .venv/bin/activate