Sets up an stm32 environment for CI. Runs the ci.sh script found within the project using this action.

For an example, see: https://github.com/milesfrain/stm32demo

Maintainer instructions: Created by following this guide: https://docs.github.com/en/actions/creating-actions/creating-a-docker-container-action

For new versions:

git tag -a -m "some note" v0.3
git push --follow-tags