Add member to triage group

[haydentherapper]

Summary

Member can add reviewers to PRs with this permission.

Release Note

Documentation

[github-actions]

🍹 preview on sigstore-github-sync/sigstore/github-prod

Pulumi report

Previewing update (sigstore/github-prod)

View Live: https://app.pulumi.com/sigstore/sigstore-github-sync/github-prod/previews/35df2aba-2498-4fe5-af7e-909b1c696da5

@ Previewing update....
pulumi:pulumi:Stack: (same)
[urn=urn:pulumi:github-prod::sigstore-github-sync::pulumi:pulumi:Stack::sigstore-github-sync-github-prod]
+ github:index/teamMembership:TeamMembership: (create)
    [urn=urn:pulumi:github-prod::sigstore-github-sync::github:index/teamMembership:TeamMembership::cmurphy-triage]
    role      : "member"
    teamId    : "5643322"
    username  : "cmurphy"
@ Previewing update....
Resources:
+ 1 to create
574 unchanged