Port the build to Gradle

Closes gh-19609
Closes gh-19608

build.gradle

@@ -0,0 +1,20 @@
+plugins {
+	id 'org.jetbrains.kotlin.jvm' apply false // https://youtrack.jetbrains.com/issue/KT-30276
+}
+
+description = 'Spring Boot Build'
+
+allprojects {
+	group 'org.springframework.boot'
+
+	repositories {
+		mavenCentral()
+		maven { url 'https://repo.spring.io/milestone' }
+		maven { url 'https://repo.spring.io/snapshot' }
+	}
+
+	configurations.all {
+		resolutionStrategy.cacheChangingModulesFor 60, 'minutes'
+	}
+
+}