Add true if inputs.cache is not set

[hoxbro]

Follow up to #6043

Actions triggered by a workflow dispatch will have github.event.inputs.cache as empty, meaning that cache not be set in the holoviz-dev/holoviz_tasks/install action and defaulting to false.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f46e512) 88.65% compared to head (122c7c5) 88.65%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6050   +/-   ##
=======================================
  Coverage   88.65%   88.65%           
=======================================
  Files         314      314           
  Lines       65688    65688           
=======================================
  Hits        58234    58234           
  Misses       7454     7454           

Flag	Coverage Δ
ui-tests	23.67% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.