run apps tests in drone when shared/css changes

[davidsbailey]

fixes https://codedotorg.atlassian.net/browse/LP-264

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (staging@2424010). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             staging   #30285   +/-   ##
==========================================
  Coverage           ?   73.05%           
==========================================
  Files              ?     2049           
  Lines              ?   112288           
  Branches           ?     3423           
==========================================
  Hits               ?    82037           
  Misses             ?    27012           
  Partials           ?     3239

Flag	Coverage Δ
#integration	55.51% <ø> (?)
#storybook	56.6% <ø> (?)
#unit	58.04% <ø> (?)

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[islemaster]

👍