chore(argo-workflows): Add sample of PostgreSQL ssl entries in values.yaml (#2307)

Signed-off-by: yu-croco <yu.croco@gmail.com>

charts/argo-workflows/values.yaml

@@ -161,6 +161,10 @@ controller:
   #   passwordSecret:
   #     name: argo-postgres-config
   #     key: password
+  #   ssl: true
+  #   # sslMode must be one of: disable, require, verify-ca, verify-full
+  #   # you can find more information about those ssl options here: https://godoc.org/github.com/lib/pq
+  #   sslMode: require
 
   # -- Default values that will apply to all Workflows from this controller, unless overridden on the Workflow-level.
   # Only valid for 2.7+