feat: add service account configuration for hydra janitor cronjob

[supercairos]

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
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• I have added tests that prove my fix is effective or that my feature works.
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Further comments

[supercairos]

See #647 on why CI is failing

[supercairos]

@Demonsthere feel free to review this :)

The CI doesn't work because of the version 0.37 being wrongly numbered (see #647 )

[Demonsthere]

works now :)

[supercairos]

Thanks :)