Make GnuPG configuration closer to the duraconf one
_Originally created by @intrigeri on [#7512 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/7512)_
We should make good use of the great work done on
<https://help.riseup.net/en/security/message-security/openpgp/best-practices>.
The example configuration file lives in
<https://github.com/ioerror/duraconf.git>.
Feature Branch: feature/7512-Make-GnuPG-config-closer-to-duraconf-reworked
### Related issues
- **Blocks** tails/tails#7416
issue