Make quarkus-ide-launcher jar reproducible

By adding an output timestamp, we can get it to be binary identical when
the content is identical.
Obviously, the date needs to be forged to be consistent between two
separate builds and the output to be cachable.

Author: gsmet

core/launcher/pom.xml

@@ -92,6 +92,7 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
                 <configuration>
+                    <outputTimestamp>2023-10-17T10:15:30Z</outputTimestamp>
                     <excludes>
                         <exclude>**/LauncherShader.class</exclude>
                     </excludes>

core/launcher/src/main/java/io/quarkus/launcher/LauncherShader.java

@@ -3,6 +3,7 @@
 import java.io.BufferedWriter;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
 import java.util.stream.Stream;
 
 /**
@@ -56,7 +57,7 @@ public static void main(String[] args) throws Exception {
                                 continue;
                             }
                             Files.createDirectories(destPath.getParent());
-                            Files.copy(p, destPath);
+                            Files.copy(p, destPath, StandardCopyOption.COPY_ATTRIBUTES);
                         }
                     }
                 }