Port the build to Gradle

Closes gh-19609
Closes gh-19608

spring-boot-project/spring-boot-cli/src/intTest/resources/run-command/quiet.groovy

@@ -0,0 +1,10 @@
+package org.test
+
+@Component
+class Example implements CommandLineRunner {
+
+	void run(String... args) {
+		print "Ssshh"
+	}
+
+}