Reproducible build

addded timestamp
added maven-artifact-plugin

Still failing with

`mvn artifact:check-buildplan`

pom.xml

@@ -58,6 +58,10 @@
          As the sonar.moduleKey inherits the value of sonar.projectKey by default, we have to override it too. -->
     <sonar.moduleKey>${project.groupId}:${project.artifactId}</sonar.moduleKey>
     <version.rewrite.plugin>4.45.0</version.rewrite.plugin>
+
+    <!-- reproducible build -->
+    <project.build.outputTimestamp>2024-01-12T00:00:00Z</project.build.outputTimestamp>
+    <version.maven.artifact.plugin>3.4.1</version.maven.artifact.plugin>
   </properties>
 
   <distributionManagement>
@@ -153,6 +157,22 @@
     <module>optaplanner-examples</module>
   </modules>
 
+  <!-- reproducible build -->
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-artifact-plugin</artifactId>
+          <version>${version.maven.artifact.plugin}</version>
+          <configuration>
+            <outputTimestamp>${project.build.outputTimestamp}</outputTimestamp>
+          </configuration>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+
   <profiles>
     <profile>
       <id>fullProfile</id>