CI: Check for `no` that is considered as a boolean by YAML spec

[simonsan]

Regarding: 41e8502

We should check in our CI for using no anywhere as a boolean instead of a string.

See YAML spec: https://yaml.org/type/bool.html

y|Y|yes|Yes|YES|n|N|no|No|NO
|true|True|TRUE|false|False|FALSE
|on|On|ON|off|Off|OFF

All of these without quotes are considered booleans. Would probably make sense to try to parse e.g. the countries and other things as boolean and compare to fields that shouldn't contain/be a boolean.

[happyleavesaoc]

Stale. Closing.