cri-api: add CRI implementation maintainers as approvers

Logistically, changes in the CRI require approval of members of the
associated CRI communities to sign-onto implementing them. This relationship
could be more formal, as this PR proposes.

The current set of people is chosen as top-level approvers of two major CRI implementations,
all of whom also regularly participate in SIG-Node and are not themselves already sig-node-approvers.

Signed-off-by: Peter Hunt <pehunt@redhat.com>

OWNERS_ALIASES

@@ -230,6 +230,10 @@ aliases:
   # emeretus:
   # - dashpole
   # - vishh
+  sig-node-cri-approvers:
+    - saschagrunert
+    - haircommander
+    - mikebrow
   sig-node-reviewers:
     - Random-Liu
     - dchen1107

staging/src/k8s.io/cri-api/OWNERS

@@ -6,6 +6,7 @@ approvers:
   - sig-node-approvers
   - sig-node-api-approvers
   - api-approvers
+  - sig-node-cri-approvers
 reviewers:
   - sig-node-reviewers
   - dims