[CI/Build] Tell ruff to generate github formatted errors

`ruff` has built-in support for generating errors in a format that
GitHub understands so that errors will be shown in the diff viewer.
This makes it easy to see errors inline with the code and without
having to open CI logs.

Signed-off-by: Russell Bryant <rbryant@redhat.com>

Author: russellb

.github/workflows/ruff.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Analysing the code with ruff
       run: |
         echo "::add-matcher::.github/workflows/matchers/ruff.json"
-        ruff check .
+        ruff check --output-format github .
     - name: Spelling check with codespell
       run: |
         codespell --toml pyproject.toml