ci: set working directory only where necessary

Author: steveoh

.github/workflows/pull_request.python.yml

@@ -14,9 +14,6 @@ jobs:
   test-unit-python:
     name: Unit tests 🐍
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: /jobs
 
     steps:
       - name: ⬇️ Set up code
@@ -30,6 +27,7 @@ jobs:
           python-version: '3.11'
           cache: pip
           cache-dependency-path: setup.py
+          working-directory: /jobs
 
       - name: 📥 Download extra dependencies
         run: |
@@ -38,9 +36,11 @@ jobs:
 
       - name: 🏗 Install module
         run: pip install .[tests]
+        working-directory: /jobs
 
       - name: 🧪 Run tests
         run: pytest
+        working-directory: /jobs
 
   test-unit-ui:
     name: Unit tests ⎔