Adds-ping-on-install

[ribalba]

Will fix the tests and and add some once we have agreed that this is the way we want to implement this.

I could also imagine that we do it on a per run basis. That would be more interesting data but privacy should be paramount here.

[ArneTR]

Looks like a good and compact implementation.

I am however not in favor of having the receiver end inside of the GMT. It is not a lot of code, but is has nothing to do there. In a worst case scenario people use it to flood other installations with bogus information because it is a an all-receiving endpoint.

Happy to merge this in when the tests work. Please just send the data to the same endpoint from Plausible as EE does it. We should install a CNAME soon to have this analytics vendor agnostic

[ArneTR]

I installed a CNAME

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