Allow setting minProtocolVersion on istio gateways

General MR

Summary

This is a follow on to big-bang/product/packages/istio-controlplane#78 (closed) that exposes the minProtocolVersion for the gateways to allow easier config. Currently this is not possible without adding to the istio.values and duplicating a lot of values - see the issue for more details.

chart/templates/istio/values.yaml

@@ -121,6 +121,10 @@ gateways:
         {{- if or (eq $tlsMode "SIMPLE") (eq $tlsMode "MUTUAL") }}
         credentialName: {{ $index }}-{{ $name }}-cert
         {{- end }}
+        {{- $tlsMinVersion := (dig "tls" "minProtocolVersion" "" $values) }}
+        {{- if $tlsMinVersion }}
+        minProtocolVersion: {{ $tlsMinVersion }}
+        {{- end }}
       {{- end }}
     {{- else if ($values.ports) }}
     {{- range $values.ports }}
@@ -134,6 +138,10 @@ gateways:
         {{- if or (eq $tlsMode "SIMPLE") (eq $tlsMode "MUTUAL") }}
         credentialName: {{ $name }}-cert
         {{- end }}
+        {{- $tlsMinVersion := (dig "tls" "minProtocolVersion" "" $values) }}
+        {{- if $tlsMinVersion }}
+        minProtocolVersion: {{ $tlsMinVersion }}
+        {{- end }}
     {{- end }}
     {{- else }}
     - hosts:
@@ -148,6 +156,10 @@ gateways:
         {{- if or (eq $tlsMode "SIMPLE") (eq $tlsMode "MUTUAL") }}
         credentialName: {{ $name }}-cert
         {{- end }}
+        {{- $tlsMinVersion := (dig "tls" "minProtocolVersion" "" $values) }}
+        {{- if $tlsMinVersion }}
+        minProtocolVersion: {{ $tlsMinVersion }}
+        {{- end }}
     {{- end }}
     {{- end }}