Only on schedule or if the templates are changed.

The linter changed the usage and doesn't require the --file flag
anymore.

Fix the breaking hook as well.

The linter can't handle it without a project, but it requires setting a
token and I'm fed up with it. If it's not useful as a git hook before
pushing, there's no point in running it in the CI (the CI wouldn't work
if the file is invalid).

For real this time.

- ci-fairy pre-commit check.
- Correctly show failing ci-fairy test.

Also, some pre-commit checks and a CI for it.