Update v5 tag

Update v4 tag

⬆️ Upgrade to Docker 20.10.6

✨ Support building multi-platform images

no_push can be used without login (#111)

- fixes #110

Don't update major, minor and patch version on pre-release

Fixes #108

✨ Support new default branch

See https://github.com/github/renaming#on-october-1-2020-newly-created-repositories-will-default-to-main

📝 Add hints for Github Container Registry

✨ Add feature for building an image without pushing it to a registry

Fixes #98