strategy: add new marker_file
strategy
#1103
Open
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Re-opening of #540 since the original fork was removed.
Original summary:
Add a simple, flexible strategy that checks /var/lib/zincati for
a JSON file (optionally containing an expiry timestamp key) named
allowfinalize.json and allows update finalization if such file
exists and has the proper permissions.
See #245 (comment) for the rationale for this new strategy.