Installer: Give unique names to OAuth2 clients

Change-Id: I218f8f8655f7662bfcd41cddaa17f3e11fcfe910
diff --git a/core/installer/values-tmpl/headscale.cue b/core/installer/values-tmpl/headscale.cue
index ec06383..18b0d6e 100644
--- a/core/installer/values-tmpl/headscale.cue
+++ b/core/installer/values-tmpl/headscale.cue
@@ -49,7 +49,7 @@
 			namespace: "\(global.namespacePrefix)core-auth"
 		}]
 		values: {
-			name: "oauth2-client"
+			name: "\(release.namespace)-headscale"
 			secretName: _oauth2ClientSecretName
 			grantTypes: ["authorization_code"]
 			responseTypes: ["code"]