Lets try this

.github/workflows/django.yml

@@ -23,6 +23,12 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Force Locale
+      run: |
+        export TZ=Europe/London
+        export LANG=en_GB.UTF-8
+        export LC_ALL=en_GB.UTF-8
+        export LANGUAGE=en_GB.UTF-8
     - name: Setup Chromedriver
       run: |
         wget https://chromedriver.storage.googleapis.com/2.36/chromedriver_linux64.zip