implement fork_review_bypass input option and reject operations on all fork PRs without required approvals by default

Author: GrantBirki

README.md

@@ -199,6 +199,7 @@ As seen above, we have a single example step. Perhaps you would actually use a r
 | `allowlist` | `false` | `"false"` | A comma separated list of GitHub usernames or teams that should be allowed to use the IssueOps commands configured in this Action. If unset, then all users meeting the "permissions" requirement will be able to run commands. Example: `"monalisa,octocat,my-org/my-team"` |
 | `allowlist_pat` | `false` | `"false"` | A GitHub personal access token with "read:org" scopes. This is only needed if you are using the "allowlist" option with a GitHub org team. For example: `"my-org/my-team"` |
 | `skip_completing` | `true` | `"false"` | If set to `"true"`, skip the process of completing the Action. This is useful if you want to customize the way this Action completes - For example, custom reactions, comments, etc |
+| `fork_review_bypass` | `true` | `"false"` | If set to "true", allow forks to bypass the review requirement if the operation is being made on a pull request from a fork. This option is potentially dangerous if you are checking out code in your workflow as a result of invoking this Action. If the code you are checking out has not been reviewed, then you might open yourself up to a TOCTOU vulnerability. You should always ensure that the code you are checking out has been reviewed, and that you checkout an exact commit sha rather than a ref. |
 
 ## Outputs 📤