Search for repositories with security vulnerabilities

schema-request

#1

Adding Repository Vulnerability Alerts is a good thing. What would be even better is the ability to search on whether vulnerabilities alerts have been created for a repository. (‘hasVulnerabilityAlert’?) For an open source project organization that has over 100 repositories (and counting), this sort of GraphQL search would allow us to systemically handle the alerts (better than a bunch of different people receiving emails).