Add SIG Release Slack configs

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

communication/slack-config/channels.yaml

@@ -240,7 +240,6 @@ channels:
   - name: sig-node-rkt
   - name: sig-openstack
   - name: sig-pm
-  - name: sig-release
   - name: sig-scalability
   - name: sig-scheduling
   - name: sig-service-catalog

communication/slack-config/restrictions.yaml

@@ -13,4 +13,8 @@ restrictions:
   - path: "sig-docs/*.yaml"
     channels:
       - "^kubernetes-docs-[a-z]{2}$"
+  - path: "sig-release/*.yaml"
+    channels:
+      - "^sig-release$"
+      - "^release-managers$"
   - path: "**/*" # prevent any other file from containing anything

communication/slack-config/sig-release/OWNERS

@@ -0,0 +1,8 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+reviewers:
+  - sig-release-leads
+approvers:
+  - sig-release-leads
+labels:
+  - sig/release

communication/slack-config/sig-release/config.yaml

@@ -0,0 +1,3 @@
+channels:
+  - name: sig-release
+  - name: release-managers