feat: allow creation of wildcard cert from values.yaml intead of externally provided

Adam, let me know if this would be the format you'd want to allow management of your cert via BB instead of an external process

CHANGELOG.md

@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 * Added Kubernetes labels to all objects created by umbrella
 * Add OIDC integration for Grafana
+* Allow creation of wildcard cert for istio ingress to be passed to BigBang chart
 
 ## [1.0.6]