ci: Add test cases for fsGroup and supplementalGroup fields

Introduce new test case to the security context bats file which verifies
that policy works properly for a deployment yaml containing fsGroup and
supplementalGroup configuration.

Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>

tests/integration/kubernetes/runtimeclass_workloads/k8s-pod-sc-supplementalgroups-deployment.yaml

@@ -0,0 +1,43 @@
+#
+# Copyright (c) 2024 Microsoft
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: policy-redis-deployment
+  labels:
+    app: policyredis
+spec:
+  selector:
+    matchLabels:
+      app: policyredis
+      role: master
+      tier: backend
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: policyredis
+        role: master
+        tier: backend
+    spec:
+      terminationGracePeriodSeconds: 0
+      runtimeClassName: kata
+      securityContext:
+        runAsUser: 2000
+        runAsGroup: 2000
+        fsGroup: 997
+        supplementalGroups:
+          - 998
+          - 999
+      containers:
+      - name: master
+        image: quay.io/opstree/redis@sha256:2642c7b07713df6897fa88cbe6db85170690cf3650018ceb2ab16cfa0b4f8d48
+        resources:
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        ports:
+        - containerPort: 6379