Migrate to self-hosted action runner

[Toeffe3]

Prevent hitting monthly limit

... by using our own server for action processing.

Description of a possible solution

Change ubuntu-latest to self-hosted ubuntu Linux or 16.04

Alternatives considered

Change runner keyword to latest, by that is misinforming since we run 16.04

[create-issue-branch]

Hi there 👋

Using this App for a private organization repository requires a paid subscription that you can buy on the GitHub Marketplace

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[create-issue-branch]

Branch issue-57-Migrate_to_self-hosted_action_runner created!

[github-actions]

Stale issue message

[Andreasgdp]

Still relevant.