Workflow file links don't work for pull requests where the workflow isn't present in the head

[jsoref]

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Bug

Body

https://github.com/jsoref/debug-github-events/actions/runs/13404384428/workflow

Workflow file for this run
.github/workflows/debug.yml at a8f5760
File not found
The workflow file could not be found.

https://github.com/jsoref/debug-github-events/actions/runs/13404384314/workflow

Workflow file for this run
.github/workflows/debug.yml at a8f5760
File not found
The workflow file could not be found.

Both items link to https://github.com/jsoref/debug-github-events/blob/a8f5760eebc94c658414aa86db3d6ff45d98c6fa/.github/workflows/debug.yml

404 - page not found
The
a8f5760eebc94c658414aa86db3d6ff45d98c6fa
branch of
debug-github-events
does not contain the path
.github/workflows/debug.yml.

---

That's not entirely wrong, the file is not in a8f5760eebc94c658414aa86db3d6ff45d98c6fa.

But it's wrong in a number of key ways:

1. There is no branch named a8f5760eebc94c658414aa86db3d6ff45d98c6fa. There are 4 branches and none of them are named as hashes.
2. The workflow isn't running from that commit (...)
3. The workflow is running from either the base (in the case of the pull request target) or
4. The workflow is running from either a pseudo-merge commit (in the case of the pull request)

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