Validation for GitHub Apps

[rcghpge]

Is there better validation for building GitHub Apps or software. How are repositories validated here to stdout with quotations when an organization or GitHub account is sourced in a gh actions pipeline.

v1 example

- name: Get token from GitHub App
   uses: actions/create-github-app-token@v1
   id: app_token
   with:
     app-id: ${{ secrets.APP_ID }}
     private-key: ${{ secrets.APP_PEM }}
     owner: ${{ github.repository_owner }}
     repositories: "<omitted, comma-separated list of repos>"