use custom action for pushing docker images

I know targetting a moving ref (main) is bad, but since I control the action, I wouldn't worry about it too much.
I want to clean up some more things in my custom actions before creating a stable v1, but for now, we'll just be on the bleeding edge

hotfix: build.yaml typos / copy-paste mistakes

* pull_request trigger was indented too far
* forgot to rename `versions` step to `statping-versions` in data print stage

Merge pull request #222 from jemand771/dev-gha-docker

Refactor GitHub actions + fix build

Merge pull request #222 from jemand771/dev-gha-docker

Refactor GitHub actions + fix build

Merge pull request #122 from statping-ng/unstable

Unstable v0.90.80 to Stable v0.90.80

Updated Changelog

Updated changelog - ready to go unstable

Merge branch 'dev' of github.com:statping-ng/statping-ng into dev

Changelog update

Version bump