Is it possible to get diff between a HEAD and the main/master branch when the context is `push`?

[kartikdc]

Hello.

Sorry if this has been asked before. But is it possible to get a diff between the main/master branch and the HEAD of the branch to which a commit has been pushed? I am aware that this is already the case for PRs but is it possible to do this in cases of push as well?

I have tried these:

  with:
    FROM: master

  env:
    FROM: master

Both don't work though I was just guessing.

Any help is appreciated. Thanks in advance.

[welcome]

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[technote-space]

I have added the BASE option, so use that.

  with:
    BASE: refs/heads/master