Move deployment to Entur hosting environment into a separate private repo

[GunnarAtEgde]

According to https://entur.atlassian.net/wiki/spaces/TP/pages/5637603329/Golden+Path+-+PO+Manifest+location
a public project like Hathor should have it's deployment actions in a separate private repo.

This will clearly separate the public project from Entur infrastructure and deployment configuration

[GunnarAtEgde]

Note also: use Entur GHA workflow, like enki