Add Gradle build that delegates to existing Ant build

Adds a top-level Gradle build that imports the existing Ant build to enable a gradual migration to Gradle while still using Ant for current tasks. Configures Ant to run JUnit (including ant-junit4) and exposes select Gradle properties to Ant; renames conflicting Ant targets to avoid collisions and makes the Gradle build task delegate to the Ant build target. Also adds placeholder Gradle files for subprojects and bumps the configured Gradle SDK version.

Co-authored-by: Mitch Gaffigan <mitch.gaffigan@comcast.net>
Signed-off-by: Nico Piel <nico.piel@hotmail.de>

Author: NicoPiel

.sdkmanrc

@@ -2,4 +2,4 @@
 # Add key=value pairs of SDKs to use below
 java=17.0.17.fx-zulu
 ant=1.10.14
-gradle=9.2.0
+gradle=9.2.1

build.gradle.kts

@@ -1 +1,71 @@
-ant.importBuild("server/mirth-build.xml")
+/*
+ * Root build file
+ * 
+ * For more detailed information on multi-project builds, please refer to 
+ * https://docs.gradle.org/8.14.3/userguide/multi_project_builds.html
+ */
+
+// Configure Ant to have access to JUnit task
+
+ant.lifecycleLogLevel = AntBuilder.AntMessagePriority.INFO
+
+configurations {
+    create("antJUnit")
+}
+
+dependencies {
+    // ant-junit4 is required for JUnit 4 annotation support (@Test, etc.)
+    "antJUnit"("org.apache.ant:ant-junit:1.10.15") {
+        exclude(group = "junit", module = "junit")
+    }
+    "antJUnit"("org.apache.ant:ant-junit4:1.10.15") {
+        exclude(group = "junit", module = "junit")
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+// Make JUnit available to Ant
+afterEvaluate {
+    ant.withGroovyBuilder {
+        "taskdef"(
+            "name" to "junit",
+            "classname" to "org.apache.tools.ant.taskdefs.optional.junit.JUnitTask",
+            "classpath" to configurations["antJUnit"].asPath
+        )
+        "taskdef"(
+            "name" to "junitreport",
+            "classname" to "org.apache.tools.ant.taskdefs.optional.junit.XMLResultAggregator",
+            "classpath" to configurations["antJUnit"].asPath
+        )
+    }
+}
+
+// Pass Gradle properties to Ant
+project.findProperty("disableSigning")?.let {
+    ant.properties["disableSigning"] = it.toString()
+}
+
+project.findProperty("disableTests")?.let {
+    ant.properties["disableTests"] = it.toString()
+}
+
+// Import existing Ant build for gradual migration
+ant.importBuild("server/mirth-build.xml") { antTargetName ->
+    // Rename conflicting Ant targets to avoid collision with Gradle built-in tasks
+    when (antTargetName) {
+        "init" -> "ant-init"
+        "build" -> "ant-build"
+
+		else -> antTargetName
+    }
+}
+
+// Make the default Gradle build task delegate to Ant's build target
+tasks.register("build") {
+    dependsOn("ant-build")
+    group = "build"
+    description = "Builds the project using Ant (delegated)"
+}

client/.classpath

@@ -1 +1 @@
-ant.importBuild("ant-build.xml")
+// ant.importBuild("ant-build.xml")

client/build.gradle.kts

@@ -1 +1 @@
-ant.importBuild("build.xml")
+// ant.importBuild("build.xml")

command/build.gradle.kts

@@ -1 +1 @@
-ant.importBuild("build.xml")
+// ant.importBuild("build.xml")

donkey/build.gradle.kts

@@ -1 +1 @@
-ant.importBuild("build.xml")
+// ant.importBuild("build.xml")

generator/build.gradle.kts

@@ -1 +1 @@
-ant.importBuild("build.xml")
+// ant.importBuild("build.xml")