ci: add test-build-quickemu.yml

[flexiondotorg]

Description

Add a new CI workflow to build and lightly test quickemu.

Type of change

• [x] New feature (non-breaking change which adds functionality)

Checklist:

• [x] I have performed a self-review of my code
• [x] I have tested my code in common scenarios and confirmed there are no regressions
• [x] I have added comments to my code, particularly in hard-to-understand sections