Add delombok for published sources jar (#151)

Co-authored-by: Clayton Walker <[email protected]>

Author: Sineaggi

grpc-spring-boot-starter/build.gradle

@@ -1,10 +1,20 @@
 apply plugin: 'maven-publish'
 apply plugin: 'signing'
 apply plugin: "de.marcphilipp.nexus-publish"
+apply plugin: 'io.franzbecker.gradle-lombok'
+
+task delombok(type: io.franzbecker.gradle.lombok.task.DelombokTask) {
+    def outputDir = file("$buildDir/delombok")
+    outputs.dir(outputDir)
+    for (srcDir in project.sourceSets.main.java.srcDirs) {
+        inputs.dir(srcDir)
+        args(srcDir, "-d", outputDir)
+    }
+}
 
 task sourceJar(type: Jar) {
     classifier "sources"
-    from sourceSets.main.allJava
+    from delombok
 }
 
 task javadocJar(type: Jar, dependsOn: javadoc) {
@@ -87,10 +97,12 @@ signing {
 }
 buildscript {
     repositories {
+        gradlePluginPortal()
         mavenCentral()
     }
     dependencies {
         classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBoot_1_X_Version}")
+        classpath "io.franzbecker:gradle-lombok:4.0.0"
     }
 }