* Support manual release channels

s3 tag

fix check

generate matrix

generate matrix

add git tagging

channel observability

version info update

handle some edge cases

* remove testing code

* update unit tests

* support rollout percentage for  latest channel

* update rollout onlyh

* update unit tests

* address review comments

* make ad-hoc changelog generation actually useful

* add github action

* remove test code

* fix whitespace

* fix formatting