删除 GitHub 上面的 tag

git tag -d [tag];
git push origin :[tag]

$ git tag -d v1.2.0
Deleted tag 'v1.2.0' (was f74dcae)

$ git push origin :v1.2.0
To git@github.com:hshanx/halo-theme-hshan.git
 - [deleted]         v1.2.0