Use gradle-reproducible-builds-plugin instead of configuring Gradle manually

gradle/reprod/init.gradle

@@ -2,6 +2,15 @@ import java.util.jar.JarEntry
 import java.util.jar.JarFile
 import java.util.jar.JarOutputStream
 
+initscript {
+   repositories {
+        maven { url 'http://jitpack.io' }
+   }
+   dependencies {
+        classpath 'com.github.johni0702:gradle-reproducible-builds-plugin:4989ae9'
+   }
+}
+
 def convertRepoToHttp = { repo ->
     if (repo instanceof MavenArtifactRepository && repo.url.toString().startsWith('https://')) {
         URL url = repo.url.toURL()
@@ -14,30 +23,5 @@ allprojects {
        repositories.all convertRepoToHttp
     }
     repositories.all convertRepoToHttp
-
-    tasks.withType(AbstractArchiveTask) {
-        preserveFileTimestamps = false
-        reproducibleFileOrder = true
-        dirMode = 0775
-        fileMode = 0664
-    }
-    // The shadow plugin doesn't seem to support the above
-    def shadowJar = tasks.findByPath ':shadowJar'
-    if (shadowJar != null) {
-        shadowJar.doLast {
-            File newFile = new File(archivePath.parent, 'tmp-' + archiveName)
-            newFile.withOutputStream { fout ->
-                JarOutputStream out = new JarOutputStream(fout)
-                JarFile jf = new JarFile(archivePath)
-                jf.entries().unique {it.name}.sort {it.name}.each {
-                    def copy = new JarEntry(it.name)
-                    copy.time = 0
-                    out.putNextEntry(copy)
-                    out << jf.getInputStream(it)
-                }
-                out.finish()
-            }
-            newFile.renameTo archivePath
-        }
-    }
+    apply plugin: de.johni0702.gradle.ReproducibleBuildsPlugin, to: project
 }