Allow Truenas server to request datasets to be unlocked

[ThorpeJosh]

Toying with idea of allowing Truenas to request datasets to be unlocked . This could be when it boots for example instead of constantly checking on a cron schedule.

First thoughts of how this might work:

• Expose an API endpoint in the container that listens for authenticated requests
• Add a curl command to the Truenas cron schedule (can select boot) to make a request to the endpoint with datasets to unlock
• The endpoint then authenticates the Truenas request and runs the unlock script for the requested datasets.

The benefits could be that if this image is run in a swarm for high availability, then there will be less network chatter compared to the cron solution.