Add more logging of timestamps in the actual code, and a few sanity
checks in unit tests.
These were useful while trying to find the root cause of #104218 and might
be useful in the future too. The solution to that issue will be committed
later.
Increase verbosity (debug → info) when checkout dir traversal fails, and
add a trace-level log for each file that is still in use. There were some
issues with symlinks, where the wrong paths were compared (see T99965) and
this log made it visible what was going wrong.
`os.IsNotExist()` is from before `errors.Is()` existed. The latter is the
recommended approach, as it also recognised wrapped errors.
No functional changes, except for recognising more cases of "does not
exist" errors as such.
Flamenco v2 allowed separate configuration of the Shaman file store and
checkout paths. This is now just one setting for "the storage". The file
store will be in `{storage}/file-store` and the checkout will happen in
`{storage}/jobs`.
This is not yet working, it's just a direct copy of the Manager of Flamenco
2, with Logrus replaced by Zerolog. The API has been documented in
flamenco-manager.yaml as a starting point for the integration.
