GitHub App Installation Authentication

[jmeridth]

Currently the GitHub OSPO GitHub Actions only allow authentication via a personal access token (PAT). Many enterprise customers require GitHub App authentication for their organizations. This is to ensure authentication is not related to a single user.

We should extend each GitHub Action to allow for this.

This introduces 3 new environment variables:

• GITHUB_APP_ID
• GITHUB_APP_INSTALLATION_ID
• GITHUB_APP_PRIVATE_KEY

See documentation for more details.

Repos (PRs):

• stale-repos: feat: allow user to use github app to authenticate stale-repos#92
• cleanowners: feat: allow github app authentication cleanowners#30
• issue-metrics: feat: authenticate with github app installation and repo standardization issue-metrics#221
• evergreen: feat: github app authentication and repo standardization evergreen#79
• contributors: feat: authenticate with github app installation and repo standardization contributors#80
• automatic-contrib-prs: feat: github app authentication and repo standardization automatic-contrib-prs#43

[jmeridth]

Complete