lint: Use GitHub output format on GitHub

This should enable inline annotations.

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>

Author: jku

.github/workflows/_test.yml

@@ -26,6 +26,8 @@ jobs:
           python3 -m pip install --constraint requirements/build.txt tox coveralls
 
       - name: Run tox
+        env:
+          RUFF_OUTPUT_FORMAT: github
         run: tox -e lint
 
   tests:

tox.ini

@@ -46,6 +46,7 @@ deps =
     -r{toxinidir}/requirements/lint.txt
     --editable {toxinidir}
 lint_dirs = tuf examples tests verify_release
+passenv = RUFF_OUTPUT_FORMAT
 commands =
     ruff check {[testenv:lint]lint_dirs}
     ruff format --diff {[testenv:lint]lint_dirs}