Users who retrieve the private-key via a PreUp field need to be able to
disable the default retrieval mechanism.
* gnu/services/vpn.scm (<wireguard-configuration>)[private-key]: Change
comment.
(wireguard-configuration-file): Conditionally serialize private-key.
* gnu/services/vpn.scm (wireguard-activation): Do not create private-key if
the field is #f.
* doc/guix.texi (VPN Services)[wireguard-configuration]: Document it.
Change-Id: Iac419809ae94eb76e97ff1f1749e2f4b3e65bb04
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
aa12068c91