Add milestone upload support

gradle/artifactory.gradle

@@ -1,12 +1,18 @@
 apply plugin: "com.jfrog.artifactory"
 
 def isSnapshot = version?.endsWith("-SNAPSHOT")
+def isMilestone = version?.matches('^.*[.-]M\\d+$') || version?.matches('^.*[.-]RC\\d+$')
 
 artifactory {
     contextUrl = 'https://repo.spring.io'
     publish {
         repository {
-            repoKey = isSnapshot ? 'libs-snapshot-local' : 'libs-release-local'
+            repoKey = 'libs-release-local'
+            if (isSnapshot) {
+                repoKey = 'libs-snapshot-local'
+            } else if (isMilestone) {
+                repoKey = 'libs-milestone-local'
+            }
             if(project.hasProperty('artifactoryUsername')) {
                 username = artifactoryUsername
                 password = artifactoryPassword

gradle/deploy-artifacts.gradle

@@ -1,11 +1,13 @@
 def isSnapshot = version?.endsWith("-SNAPSHOT")
+def isMilestone = version?.matches('^.*[.-]M\\d+$') || version?.matches('^.*[.-]RC\\d+$')
+def isRelease = !(isSnapshot || isMilestone)
 
 task deployArtifacts {
     group = 'Deploy tasks'
     description = "Deploys the artifacts to either Artifactory or Maven Central"
-    if(isSnapshot) {
-        dependsOn "artifactoryPublish"
-    } else {
+    if(isRelease) {
         dependsOn "uploadArchives"
+    } else {
+        dependsOn "artifactoryPublish"
     }
 }

gradle/finalize-deploy.gradle

@@ -1,5 +1,6 @@
 def isSnapshot = version?.endsWith("-SNAPSHOT")
-def isRelease = !isSnapshot
+def isMilestone = version?.matches('^.*[.-]M\\d+$') || version?.matches('^.*[.-]RC\\d+$')
+def isRelease = !(isSnapshot || isMilestone)
 
 task finalizeDeployArtifacts {
 }

gradle/ossrh.gradle

@@ -1,5 +1,6 @@
 def isSnapshot = version?.endsWith("-SNAPSHOT")
-def isRelease = !isSnapshot
+def isMilestone = version?.matches('^.*[.-]M\\d+$') || version?.matches('^.*[.-]RC\\d+$')
+def isRelease = !(isSnapshot || isMilestone)
 
 if(project.hasProperty("signing.keyId") && isRelease) {
 	apply plugin: "signing"