* Fixes to micropython examples
Added missing images and fonts under 'assets'. Since .bin is in gitignore, renamed fonts to .fnt
* Update build_micropython workflow
Build the unix port dev variant and run tests.
See: https://github.com/lvgl/lv_binding_micropython/issues/151
Fetch both head and merge commits of "pull" refs. This would allow the CI script to first try checkout the merge commit (which is `github.sha` on PR) and only if that fails, default to checking out the PR head.
