Update pwd and pythonpath

.github/workflows/eluc.yml

@@ -10,19 +10,20 @@ on:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
-
+    defaults:
+      run:
+        working-directory: ./use_cases/eluc
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python 3.10
       uses: actions/setup-python@v3
       with:
         python-version: "3.10"
-    - name: Change working directory
-      run: cd use_cases/eluc
     - name: Set PYTHONPATH
-      run: export PYTHONPATH=$PWD
+      run: echo "PYTHONPATH=$PWD" >> $GITHUB_ENV
+    - name: Test PYTHONPATH
+      run: printenv PYTHONPATH
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip