* Create GitHub Action for pylint script.
* Fix indent
* Add back incremental flag from TF, remove allowlist.
Running a full-repo pylint with Github Actions CI takes >40 minutes,
too long for use on presubmit.
Allowlist is per-file, so the TF allowlist offers nothing here.
* Fetch master so our script has something to diff against.
* Checkout as branch rather than as merge.
This should (?) get us only our modified files.
* Diff to common ancestor.
* Terrible no-good commit introducing linter error.
* Point to locally fetched master.
* debug logging
* HEAD missing?
* Fetch full branches.
* Fetch master again.
* Revert "debug logging"
This reverts commit 6edde81953.
* Revert "Terrible no-good commit introducing linter error."
This reverts commit ac41b83034.
