[SECURESIGN-1479] Trillian TLS: add external DB TLS CA certificate

[fghanmi]

No description provided.

[SequeI]

lgtm, nice work

[bkabrda]

This looks good, thanks! Is there a way we could extend the user_provided molecule scenario to test for this?

[bkabrda]

There seems to be an error in the molecule default scenario execution, can you please take a look?

  TASK [Setting tas_single_node_trillian_trusted_ca] *****************************
  fatal: [18.117.96.15]: FAILED! => {"msg": "The 'file' lookup had an issue accessing the file '/etc/mysql/ssl/ca-cert.pem'. file not found, use -vvvvv to see paths searched"}