* Move Morello CI to track default release
- Log some details of the build environment
- Remove workarounds overcome by events
* Morello CI: parameterize run queue and boot env
* Morello CI to run as a non-root user
For reasons unrelated to snmalloc, it's become more convenient to engage
in a little white lie, as it were, that the CI jobs are not `root` on
the worker nodes. So I'm testing changes on the cluster orchestration
goo to run the github runner as a non-root user. However, much as with
GitHub's own runners, the runner user is in the `wheel`, and `root` will
have no password, so we can still `su` up to `root` when needed.
Of course, when we are already root, we can `su` to anyone we like,
including `root`, so these changes are compatible with both the old and
new world order and have been tested with both.
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