Configure spring repos conditionally

- Depending on a build, use milestone and/or snapshot repos
- Relates #1122

build.gradle

@@ -82,9 +82,12 @@ configure(javaProjectsAndRoot) {
 
 	repositories {
 		mavenCentral()
-		maven { url 'https://repo.spring.io/libs-snapshot' }
-		maven { url 'https://repo.spring.io/libs-release' }
-		maven { url 'https://repo.spring.io/libs-milestone' }
+		if (version.contains('-')) {
+			maven { url "https://repo.spring.io/milestone" }
+		}
+		if (version.endsWith('-SNAPSHOT')) {
+			maven { url "https://repo.spring.io/snapshot" }
+		}
 	}
 
 	configurations {

settings.gradle

@@ -2,6 +2,12 @@ pluginManagement {
 	repositories {
 		gradlePluginPortal()
 		maven { url 'https://repo.spring.io/release' }
+		if (version.contains('-')) {
+			maven { url 'https://repo.spring.io/milestone' }
+		}
+		if (version.endsWith('-SNAPSHOT')) {
+			maven { url 'https://repo.spring.io/snapshot' }
+		}
 	}
 }