Project rebuild on config change

[CodeGat]

We currently have a workflow_dispatch trigger on dep-image-1-start.yml, but there aren't many cases in which we would want to run this pipeline outside of the triggers defined on the workflow.
Investigate if we can remove the workflow_dispatch trigger and perhaps replace it with one of the use cases that the workflow_dispatch trigger might have been good for: rebuilding the project when config/models.json or config/compilers.json are updated.
This can involved triggering on pull_request whenever the config directory changes, validating the config files, and running the dep-image pipeline.

Should close #106 !