[WIP] Test examples in CI

[akihironitta]

Just trying out what example tests should look like in CI. This PR doesn't have to be merged into the main branch before the next release, but it'll be useful to quickly make sure examples work for future releases.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.37%. Comparing base (3f1a695) to head (7b89860). Report is 108 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #295   +/-   ##
=======================================
  Coverage   93.37%   93.37%           
=======================================
  Files         116      116           
  Lines        5842     5842           
=======================================
  Hits         5455     5455           
  Misses        387      387           

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