[gcloud-sqlproxy] fix #145 use sha1sum instead of randAlphaNum

stable/gcloud-sqlproxy/Chart.yaml

@@ -19,4 +19,4 @@ name: gcloud-sqlproxy
 sources:
 - https://github.com/rimusz/charts
 type: application
-version: 0.25.3
+version: 0.25.4

stable/gcloud-sqlproxy/README.md

@@ -165,7 +165,8 @@ GCP does not support more than 5 endpoints on an Internal Load Balancer. To work
 
 Please note, as of `0.25.0` use [cloud-sql-proxy v2](https://github.com/GoogleCloudPlatform/cloud-sql-proxy/blob/main/migration-guide.md). The `httpPortProbe` replaced `httpLivenessProbe.port` & `httpReadinessProbe.port`.
 
-Please note, as of `0.25.3`, if the value of `cloudsql.instances[].instanceShortName` remains undefined, an instanceShortName of 15 characters length will be generated, with a combination of first 5 letters of the instance name, then a hypen "-" and the remaining 9 characters will be autogenerated.
+
+Please note, as of `0.25.3`, if the value of `cloudsql.instances[].instanceShortName` remains undefined, an instanceShortName of 15 characters length will be generated, with a combination of first 5 letters of the instance name, then a hypen "-" and the remaining 9 characters will be autogenerated using sha1sum of the `instance` name.
 
 **From <= 0.22.2 to >= 0.23.0**
 

stable/gcloud-sqlproxy/templates/_helpers.tpl

@@ -94,7 +94,7 @@ Create the name of the service account to use
 Create the short instance name
 */}}
 {{- define "gcloud-sqlproxy.instanceShortName" -}}
-{{- $randomString := randAlphaNum 9 | lower -}}
+{{- $randomString := sha1sum .instance | lower  | substr 0 9   -}}
 {{ .instanceShortName | default (printf "%s-%s" (.instance | trunc 5 | trimSuffix "-") $randomString) }}
 {{- end -}}