build: Add OWNERS on build-image/

Here we're primarily concerned with the kube-cross image, though we
may expand scope at a later time.

Adding the following reviewers/approvers:
- BenTheElder
- cblecker
- dims
- justaugustus
- listx

Once we've defined policies for handling these images, we'll expand the
scope of this group to include Release Engineering.

Signed-off-by: Stephen Augustus <saugustus@vmware.com>

OWNERS_ALIASES

@@ -128,6 +128,18 @@ aliases:
     - justaugustus # SIG Chair
     - saschagrunert # Branch Manager
     - tpepper # SIG Chair / Patch Release Team
+  build-image-approvers:
+    - BenTheElder
+    - cblecker
+    - dims
+    - justaugustus
+    - listx
+  build-image-reviewers:
+    - BenTheElder
+    - cblecker
+    - dims
+    - justaugustus
+    - listx
 
   sig-storage-reviewers:
     - saad-ali

build/build-image/OWNERS

@@ -0,0 +1,10 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+approvers:
+  - build-image-approvers
+reviewers:
+  - build-image-reviewers
+
+labels:
+  - sig/release
+  - area/release-eng