Correct the runIDFromURLRE regex to properly match the callbackURL

[pputman-clabs]

the callbackURL from the event previously didn't match with the regex, and was always causing a "no match found error". This includes the full URL and should match.

[gmlewis]

I should have caught this before (sorry about that), but this repo supports both public GitHub and enterprise GitHub installations, which means that we can't hard-code a domain name in a regex.

Instead of your change, we should simply remove the leading carat (^) and then it should support both styles of URLs.

Please update this PR and then add a test for both styles of URLs showing that it should work on both. Thank you, @pputman-clabs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.03%. Comparing base (a25b53e) to head (2cb7af7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3495 +/- ##
=======================================
Coverage 91.03% 91.03% =======================================
Files 179 179 Lines 15574 15574 =======================================
Hits 14178 14178 Misses 1223 1223 Partials 173 173 

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[gmlewis]

One more tweak, please, @pputman-clabs, then we should be ready for a second LGTM+Approval from any other contributor to this repo before merging.

[gmlewis]

Thank you, @pputman-clabs!
LGTM.

Awaiting second LGTM+Approval from any other contributor to this repo before merging.

[gmlewis]

@stevehipwell - might you have time for a code review? Thank you!

[stevehipwell]

LGTM

[gmlewis]

Thank you, @stevehipwell!
Merging.