feat: add hook scripts to pod

[wrenix]

Pull Request

Description of the change

first step or prepare to #466

thanks for this hint @jessebot https://github.com/nextcloud/helm/issues/466#issuecomment-1857616753

Benefits

not needed to create a own secret and complex mount per extraVolumes needed to setup such hooks like in: https://github.com/nextcloud/docker#auto-configuration-via-hook-folders

descripted

Checklist

• [x] DCO has been signed off on the commit.
• [x] Chart version bumped in Chart.yaml according to semver.
• [ ] (optional) Variables are documented in the README.md

[provokateurin]

Just need to solve the conflicts

[wrenix]

rebased ;)