GitHub ubuntu-latest runner does not support python 3.7, so using ubuntu-22.04 instead.

Author: rlan

.github/workflows/python-app.yml

@@ -14,7 +14,7 @@ permissions:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     strategy:
       matrix:
@@ -30,9 +30,11 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Install the code linting and formatting tool Ruff
+      run: |
+        pipx install ruff
     - name: Lint with Ruff
       run: |
-        pip install ruff
         ruff check --output-format=github .
     - name: Test with example.csv
       run: |