Add workflow with several Gradle builds to demo job summary

.github/workflow-samples/groovy-dsl/settings.gradle

@@ -1 +1,13 @@
-rootProject.name = 'basic'
+plugins {
+    id "com.gradle.enterprise" version "3.10.1"
+}
+
+gradleEnterprise {
+    buildScan {
+        termsOfServiceUrl = "https://gradle.com/terms-of-service"
+        termsOfServiceAgree = "yes"
+        publishAlways()
+        uploadInBackground = false
+    }
+}
+rootProject.name = 'groovy-dsl'