Add user jku and team tuf-root-signing-staging-codeowners (#348)

* tuf-root-signing-staging-codeowners is for maintainers of
  planned root-signing-staging repository (see #345)
* New user jku as well as kommendorkapten and haydentherapper are
  added to the new team
* The repository is not defined yet as I understood the team needs to
  exist before it can have an id which is required to define the
  repository

Fixes #347.

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>

github-sync/github-data/sigstore/teams.yaml

@@ -107,6 +107,9 @@ teams:
   - name: tuf-root-signing-codeowners
     privacy: closed
     description: ""
+  - name: tuf-root-signing-staging-codeowners
+    privacy: closed
+    description: ""
   - name: sigstore-conformance-codeowners
     privacy: closed
     description: "Codeowners for sigstore/sigstore-conformance"

github-sync/github-data/sigstore/users.yaml

@@ -226,6 +226,8 @@ users:
         role: member
       - name: tuf-root-signing-codeowners
         role: member
+      - name: tuf-root-signing-staging-codeowners
+        role: member
       - name: sigstore-oncall
         role: member
       - name: security-response-team
@@ -273,6 +275,11 @@ users:
     teams:
       - name: public-good-instance-team
         role: member
+  - username: jku
+    role: member
+    teams:
+      - name: tuf-root-signing-staging-codeowners
+        role: member
   - username: jleightcap
     role: member
     teams:
@@ -309,6 +316,8 @@ users:
         role: member
       - name: tuf-root-signing-codeowners
         role: member
+      - name: tuf-root-signing-staging-codeowners
+        role: member
   - username: lkatalin
     role: member
     teams: