Persist a random seed across boots
_Originally created by @bertagaz on [#11897 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/11897)_
Given I boot Tails from a USB stick
Then I want to have good entropy from a random seed, regardless of whether I have persistence enabled or not
Blueprint: https://tails.boum.org/blueprint/randomness_seeding
Feature Branch: feature/11897-improve-random-seed-file, installer:segfault/feature/11897-Create-install-ramdom-seed
issue