[DEV] Workflow Changes

[hypherionmc]

I want to implement the following workflow changes to this project:

• [x] Add a dev branch, so all development work is not done on release. Releases to be triggered when pushing to release branch
• [x] Add snapshot releases for dev branch so that they can be used/tested
• [ ] Sign releases with GPG - Will use keymaster
• [ ] Move secrets out of ENV variables and onto doppler - dopple

Long Term

• [ ] Publish releases to Gradle Plugin Portal