Update CI checks to only run on code changes

**Is your feature request related to a problem? Please describe.**

If I update readme or some other markdown file, the entire app shouldn't be rebuilt across all platforms. It's wasteful.

**Describe the solution you'd like**

Conditionally run checks only if certain files are modified. Paths can be specified in the `on.push.paths` block.

**Describe alternatives you've considered**
NA

**Additional context**
NA

Inspect the repository's GitHub Actions workflow files and start with their trigger configuration. Use the issue's path-filter requirement to identify which changes should run the checks, then verify that markdown-only changes skip the builds while code changes still trigger them.

Written by the indexing model from the issue text.