v1.0.0 - First versioned release

This is the first versioned release of mediathekview-docker.
I set it up so that dependency management tools like Renovate or Dependabot can automatically trigger updates whenever a new version is released.

✨ Added

• Build workflow for versioned builds
• Caching for faster builds

🛠 Changed

• Update docker baseimage to v4.8.1
• Update to Java 23