knadh/Approve PR creation from Issue

Mandate PR creation to require an explicit approval comment from a repo maintainer on an Issue discussion

Trust Signals

name	description	required	default
approval_str	Approval comment string to look for in the issue comment. Must include `{user}` which is substituted with the PR author's username.	no	/pr-welcome {user}
reference_str	Reference string in PR body pointing to the approval comment. Must include exactly one `{url}` placeholder.	no	/pr-clearance {url}
pr_autoclose_message	Comment posted on the PR on auto-close/rejection.	no	This PR was automatically closed because the reference to approval (issue) could not be found. Please open an issue first, get clearance from the maintainer, and reference the approval comment URL in your PR body in the format `/pr-clearance {url}`.
exclude_past_contributors	Skip checks for users who have previously contributed commits to the repo.	no	false
github_token	GitHub token for API calls.	no	${{ github.token }}
min_diff_files	Min number of changed files in the PR to apply checks. 0 always checks.	no	0
min_diff_lines	Min number of changed lines in the PR to apply checks. 0 always checks.	no	0

no outputs