fix(helm): generate sqlConnectionSuperuser secret for external databases (#2297)

Author: jezekra1

helm/templates/config/secret.yaml

@@ -35,7 +35,7 @@ data:
        (include "agentstack.databaseName" .)
        | b64enc | quote
   }}
-  {{- if and .Values.postgresql.enabled .Values.postgresql.auth.enablePostgresUser }}
+  {{- if or (and .Values.postgresql.enabled .Values.postgresql.auth.enablePostgresUser) (and (not .Values.postgresql.enabled) .Values.externalDatabase.adminUser .Values.externalDatabase.adminPassword) }}
   sqlConnectionSuperuser: {{ printf "postgresql+asyncpg://%s:%s@%s:%s/%s"
        (include "agentstack.databaseAdminUser" .)
        (include "agentstack.databaseAdminPassword" .)