Clean up release pipeline

[kwek20]

Description

Thers like 4 different older release pipeline code everywhere. We gotta clean house and.. heck.. maybe use github pipeline!

Motivation

Nobody knows what to do, including me

Currently i do it all manual:

have GPG in secret somewhere
have sonatype nexus account encrypted somwhere
call following: 
mvn -s /c/Users/Brord/.m2/settings.xml clean package install deploy -Pbuild,release -DskipTests -Dmaven.install.skip=true

Requirements

merge to master -> automatic release merge to dev -> automatic snapshot

Open questions (optional)

Do we want the automatic on dev feature?

Are you planning to do it yourself in a pull request?

Who knows!