Skip and cancel intermediate builds

[devmotion]

This PR changes the Github CI template such that intermediate builds are always skipped and cancelled in PRs.

I was not sure if you would like this to be an opt-in or opt-out feature. I guess opt-out would be most useful if you would like to add a configuration option.

Fixes #323.

[codecov]

Codecov Report

Merging #325 (e895da0) into master (336ac2f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   94.78%   94.78%           
=======================================
  Files          20       20           
  Lines         614      614           
=======================================
  Hits          582      582           
  Misses         32       32           

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[nickrobinson251]

thanks!

an opt-in or opt-out feature. I guess opt-out would be most useful if you would like to add a configuration option.

is there a reason to even add it is an option? if there is, then i agree that opt-out sounds best. But i'd be inclined to just merge as-is. We can always add a config option at a later date if it's requested

[devmotion]

I don't think an option is needed, I was just not sure what you would prefer.