[4.5.X] Refactor DB cache management in runtests and runmigration #299
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Backport of #252 for the 4.5.X branch
Gives most variables a default value making them changable with var=${var:=default}
Extract db restore and dump in a separate db.sh file.
Change (default) value for cachedb directory to make it easier to set a volume on it.
Add || true in runmigration when doing ls -v to ignore the error status and set an empty CACHED_DUMP variable.
Improve slightly the messages.
This should fix issue of renaming in bin/runmigration of the dump file name which stayed the same as the restored one. (and in worst case to an empty filename on github actions)