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Description of proposed changes
Original reasoning by @tsibley in nextstrain/cli@fab709a:
Running on push and PRs is often redundant. For PRs, we really care about the putative merge of the PR branch, and that's what "on: pull_request" tests. We typically do not need push-level CI results for PRs. On the other hand, CI results for every push to master are nice to have both as a safety backstop and for the linear chain of CI history it produces (e.g. to debug the impact of external changes on our CI).
The primary downside I see is that you can no longer push without opening a PR just to see what CI says, but I think that's an acceptable tradeoff, especially now that draft PRs are a thing. To mitigate this downside, "on: workflow_dispatch" allows CI to be manually dispatched for a specific branch/tag/commit if you really don't want to open even a draft PR.
Trimming unnecessary CI jobs reduces the time to completion for CI runs (good for the dev loop) and reduces organization-level job queuing, which can negatively impact the workflows of other repos.
Related issue(s)
N/A
Testing