Using the "lockfile". (#2992)
* Using the "lockfile".
* Revert dummy modifications.
* Lock on python 3.11
* Another attempt.
* ..
* Bad cache hits.
* The good old monkey.
* How in the world...
* We need the launcher still.
* .
* ..
* Attempt #42
* Don't break all other builds.
* Mode max.
* Applying to other builds.
