Custom commit message when running a PR script

[jtpio]

Problem

Right now the PR script workflows creates a new commit with "Run maintainer script" as the message.

It would be nice to be able to pass a custom commit message as part of the workflow inputs. For example "Lint" when running a lint script.

Proposed Solution

Probably we can pass the input down to the script, so it can be picked up here:

maintainer-tools/pr_script.py

Line 65 in 1b43480

run(f"git commit -a -m 'Run maintainer script' -m 'by {maintainer}' -m '{json.dumps(script)}'")

Additional context

Example commit currently generated: jupyterlab/jupyterlab@6971c03

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