Nightly runs for govulncheck

[psilva-veeam]

Is your feature request related to a problem? Please describe.

Already merged code should be scanned with govulncheck as well. E.g. when a new vulnerability emerges in the mean-time.

(Github Action for govulncheck was added in #2752)

Describe the solution you'd like

Nightly runs should be added. Possibly in a separate pipeline and with continue-on-error: false

Describe alternatives you've considered

Automatically creating Github issues as reminders on failures might be useful. It could also be used for notifications when a Github Team is tagged in the text. Probably a separate issue should be created though if needed.

Environment

Additional context

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