Nice Action!
In my opinion, variables like prbody, prurl and PRNUM would be more readable if they had underscores (_) or hyphens (-) to separate them.
prurl ➡️ pr-url (underscore didn't look good to me here)
prbody ➡️ pr-body (underscore didn't look good to me here)
PRNUM ➡️ PR_NUM (hyphen didn't look good to me here)
Cc: @tusharnankani