fix keycloak secrets drift (cozystack#509)

Author: kvaps

packages/system/keycloak/templates/sts.yaml

@@ -1,7 +1,7 @@
 {{- $cozyConfig := lookup "v1" "ConfigMap" "cozy-system" "cozystack" }}
 {{- $host := index $cozyConfig.data "root-host" }}
 
-{{- $existingPassword := lookup "v1" "Secret" "cozy-keycloak" "{{ .Release.Name }}-credentials" }}
+{{- $existingPassword := lookup "v1" "Secret" "cozy-keycloak" (printf "%s-credentials" .Release.Name) }}
 {{- $password := randAlphaNum 16 -}}
 {{- if $existingPassword }}
   {{- $password = index $existingPassword.data "password" | b64dec }}