I am looking for a provider who installs Kirby as a package and maintains the versions. Is there a recommendation. For example, Hetzner or something?
I would answer your question with no. There are several reasons for this:
Kirby relies on a file system-based concept without a database. Updates often require manually exchanging core files. This process is less automatable and requires care to avoid overwriting customisations.
Compared to WordPress or other similar CMS, Kirby is less widespread. As a result, many hosting providers do not offer special tools or automated processes for Kirby updates.
Kirby websites are often highly customised. Automatic updates could lead to compatibility issues if customised features or plugins no longer work correctly.
Automated updates without proper review can pose security risks. Kirby believes that updates should be carried out consciously and in a controlled manner to ensure the integrity of the website.
Kirby is a commercial CMS that must be licensed per domain. Automatic updates via the provider could violate or complicate the licence terms, as the licence keys must be managed correctly.
Therefore, it is recommended that updates for Kirby be carried out manually, following the official instructions and best practices.