Add support for multiple GH repos

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.59259% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 60.61%. Comparing base (82c7c7d) to head (eafdd73).

Files	Patch %	Lines
sam/slack.py	0.00%	1 Missing :warning:
sam/utils.py	91.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #58 +/- ## ========================================== + Coverage 59.15% 60.61% +1.45% ========================================== Files 11 11 Lines 404 424 +20 ========================================== + Hits 239 257 +18 - Misses 165 167 +2 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ GitHubAPIError: The GitHub API call failed. sam.contrib.github in create_issue View Issue

_{Did you find this useful? React with a 👍 or 👎}