Make builds reproducible

Signed-off-by: Alexander Brandes <mc.cache@web.de>

Bukkit/build.gradle.kts

@@ -113,5 +113,6 @@ tasks {
         opt.encoding("UTF-8")
         opt.keyWords()
         opt.addStringOption("-since", isRelease)
+        opt.noTimestamp()
     }
 }

Core/build.gradle.kts

@@ -78,5 +78,6 @@ tasks {
         opt.encoding("UTF-8")
         opt.keyWords()
         opt.addStringOption("-since", isRelease)
+        opt.noTimestamp()
     }
 }

build.gradle.kts

@@ -209,6 +209,11 @@ subprojects {
         test {
             useJUnitPlatform()
         }
+
+        withType<AbstractArchiveTask>().configureEach {
+            isPreserveFileTimestamps = false
+            isReproducibleFileOrder = true
+        }
     }
 }