add flake to workflow

.github/workflows/python-app.yml

@@ -21,9 +21,14 @@ jobs:
           with:
               python-version: "3.10"
 
+        - name: Install dependencies
+          run: |
+              python -m pip install --upgrade pip
+              pip install flake8
+
         - name: Lint with flake8
           run: |
               # stop the build if there are Python syntax errors or undefined names
               flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
               # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-              flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+              flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics