misc, test: Some quality of life improvements

Add a fold in github actions output around the ragel build.

Run the commit-message test locally, so that error can be detected
before pushing to CI. We also now accept two-letter topics.

Some minor improvement in the testing scripts.

test.sh

@@ -31,7 +31,8 @@ function run-testsuite() {
 	# if not running all tests or if this test is not explicitly selected, skip it
 	if test -z "$testsuite" || test "test-$testsuite" = "$testname"; then
 		fold_start "$testname"
-		"$@" || failures=$([ -n "$failures" ] && echo "$failures\\n$@" || echo "$@")
+		description="$testname ($@)"
+		"$@" || failures=$([ -n "$failures" ] && echo "$failures\\n$description" || echo "$description")
 		fold_end "$testname"
 	fi
 }