CI: Forcing GitHub actions to activate
GitHub actions won't start running until the first action is committed.

This PR adds a simple action with an echo, so we can activate GitHub actions risk free, and when we move an actual build, the action will run in the PR, and we can see that it works.

Tested this action in a test repo, to make sure it works: https://github.com/datapythonista/xql/commit/cdc596df626da5f81980c773de94269546880753/checks?check_suite_id=314215608