[ci] avoid duplicate AppVeyor builds #3096
Merged
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Currently, we run the same build logic twice on AppVeyor for every commit to
master
or a branch with a PR intomaster
.This slows development because on the free tier of AppVeyor we are limited to one build at a time.
In this PR, I propose that we only build once on PRs and on every commit to
master
. I think this should work per: https://help.appveyor.com/discussions/problems/14586-build-any-pull-requests-against-any-branches.