Storing this key in secrets.yml was a bad idea,
it would require users using HA setups to manually
replicate secrets across nodes during update,
it also needed support from omnibus package
* Revert "Generate Let's Encrypt private key"
This reverts commit 444959bfa0b79e827a2a1a7a314acac19390f976.
* Add Let's Encrypt private key to settings
as encrypted attribute
* Generate Let's Encrypt private key
in database migration
Fixes that make this work:
* A change in Ruby (https://github.com/ruby/ruby/commit/ce635262f53b760284d56bb1027baebaaec175d1)
requires passing in the exact required length for OpenSSL keys and IVs.
* Ensure the secrets.yml is generated before any prepended modules are
loaded. This is done by renaming the `secret_token.rb` initializer to
`01_secret_token.rb`, which is a bit ugly but involves the least impact on
other files.
