Find the git commit you want to rollback to:
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git log -n20 git checkout <commit hash>
git reset --hard <commit hash> git push origin HEAD:master --force
Note this can inconvenience some users because they can end up with conflicts since you did a a forced push.
So another approach after checking your commit, is to create a new branch and then create a PR to merge in the rollbacked code:
git checkout -b rollbacked-code git push # then create a PR