Disable integTest when Docker is not available (#40585)

* Disable integTest when Docker is not available

Resolves: #40549

x-pack/qa/saml-idp-tests/build.gradle

@@ -38,6 +38,9 @@ task setupPorts {
         idpMetaFile.write(content.toString(), "UTF-8")
     }
 }
+// Don't attempt to get ephemeral ports when Docker is not available
+setupPorts.onlyIf { idpFixtureProject.postProcessFixture.enabled }
+
 integTestCluster.dependsOn setupPorts
 
 integTestCluster {