ci: prod rvd tests

[JeremyTubongbanua]

relies on #449 to be merged first

closes #372

- What I did

Periodic prod tests that test 4 things:

• current release sshnp, sshnpd, work with sshrvd
• current release sshnp, sshnpd, work with @rv_am
• current release sshnp, sshnpd, work with @rv_eu
• current release sshnp, sshnpd, work with @rv_ap

Runs every hour

schedule:
    - cron: "2 * * * *" # “At minute 2.” https://crontab.guru

Also:

• added template_name arg to setup-sshrvd-entrypoint

- How I did it

- How to verify it

- Description for the changelog

[XavierChanth]

Don't need SSH*_ATSIGN_KEYS environment variables, that's what the setup keys steps are for down below