security/acme-client: restart www/caddy automation added

[Monviech]

I have added an automation to restart Caddy when the Acme Client certificates are used.

Hope it's correct this way. Thank you ^^

[fraenki]

There's an alternative approach available: add a description to the configd actions of www/caddy:
https://github.com/opnsense/plugins/blob/master/www/caddy/src/opnsense/service/conf/actions.d/actions_caddy.conf#L13-L17

Then they would be automatically available in ACME client:
Automations -> Add -> Run Command: System of Plugin Command

However, if you prefer this PR, I'd have no objections to merge it.

[Monviech]

The description sounds better maintainable:
https://github.com/Monviech/opnsense-plugins/blob/74f9521c99ae211851da18bab7edc3fa8cf1bda9/www/caddy/src/opnsense/service/conf/actions.d/actions_caddy.conf#L18

Thanks for explaining it. Since its an edge case to restart Caddy with the ACME client since by default it does its own Let's Encrypt, I don't have any problem with it that it's more hidden.