Add GitHub actions for building and releasing

[TheDukeofErl]

This adds a couple of actions as follows:

• build-artifact.yml: builds an artifact for testing purposes on a push to master, PR, or modification of PR
• release.yml: builds and creates a release when a tag that matches "v." is pushed

[TheDukeofErl]

A testing artifact can be seen here: https://github.com/TheDukeofErl/BBCF-Improvement-Mod/actions/runs/6554472646 A release can be seen here: https://github.com/TheDukeofErl/BBCF-Improvement-Mod/releases/tag/v1.3-asdf