add GitHub workflow job for checking coding style and linting

Author: rdmark

.github/workflows/test.yml

@@ -23,3 +23,17 @@ jobs:
         nc -z localhost 5005
         sleep 2
         kill $PID
+
+  code_standards:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+    - uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6.1.0
+      with:
+        python-version: 3.9.25
+        cache: 'pip'
+    - run: pip install -r requirements.txt
+      id: pip
+    - run: black --check .
+    - run: flake8 .
+      if: success() || failure() && steps.pip.outcome == 'success'