Error in nginx when starting registry-proxy (#4785)

Error starting nginx because in requiredDropCapabilities is dropped all capabilities.

The nginx requires the following capabilities:
- CHOWN
- SETGID
- SETUID

Signed-off-by: André R. de Miranda <andre@miranda.work>

roles/kubernetes-apps/registry/templates/registry-proxy-psp.yml.j2

@@ -17,7 +17,16 @@ spec:
   privileged: false
   allowPrivilegeEscalation: false
   requiredDropCapabilities:
-    - ALL
+    - SETPCAP
+    - MKNOD
+    - AUDIT_WRITE
+    - NET_RAW
+    - DAC_OVERRIDE
+    - FOWNER
+    - FSETID
+    - KILL
+    - SYS_CHROOT
+    - SETFCAP
   volumes:
     - 'configMap'
     - 'emptyDir'