Update
Build only branches, tags, or both
If you only want to build tags, you can now optionally switch off building branches 🚦
We've added a new setting: Build branches that is on by default for new pipelines. To only build on tags, disable Build branches and ensure that your Build tags box is checked:
You can find the Build tags and the new Build branches setting in your pipeline's Repository settings when using GitHub, GitHub Enterprise, Bitbucket, or Bitbucket Server.