SLING-9944 Bundle configurations and reference via classpath protocol

add sling-configs
diff --git a/src/test/java/org/apache/sling/karaf/tests/configuration/SlingQuickstartOakTarConfiguration.java b/src/test/java/org/apache/sling/karaf/tests/configuration/SlingQuickstartOakTarConfiguration.java
index b3e2514..379f221 100644
--- a/src/test/java/org/apache/sling/karaf/tests/configuration/SlingQuickstartOakTarConfiguration.java
+++ b/src/test/java/org/apache/sling/karaf/tests/configuration/SlingQuickstartOakTarConfiguration.java
@@ -53,6 +53,7 @@
             editConfigurationFilePut("etc/org.apache.sling.jcr.davex.impl.servlets.SlingDavExServlet.config", "alias", "/server"),
             editConfigurationFilePut("etc/org.apache.sling.jcr.repoinit.RepositoryInitializer-test.config", "scripts", scripts),
             addSlingFeatures(
+                "sling-configs",
                 "sling-quickstart-oak-tar",
                 "sling-auth-form",
                 "sling-models",