allow customizing the pr assignee

[omercnet]

Hello!

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Issue details

When running this in a github action the GITHUB_TOKEN belongs to @github-actions[bot], so using @me as the assignee fails, allowing to customize the assignee would help mitigate that

[rquitales]

@omercnet Thanks for reporting this enhancement and supplying a PR to address this. We look forward to working with you on merging this in.