Add project.build.outputTimestamp Maven property

Author: vy

pom.xml

@@ -127,6 +127,15 @@
     <maven.compiler.target>8</maven.compiler.target>
     <maven.compiler.release>8</maven.compiler.release>
 
+    <!-- `project.build.outputTimestamp` is required to be present for reproducible builds.
+         We actually inherit one from the `org.apache:apache` through our parent `org.apache.logging:logging-parent`.
+         Though inheriting this property has two undesired consequences:
+         1. `artifact:compare` dumps an `ERROR` log stating that this `property should not be inherited but defined` (apache/logging-parent#50)
+         2. This value is employed in various places while creating the distribution
+         To mitigate these, we define a *dummy* value here and let the CI replace it during a release.
+         Hence, *DO NOT MANUALLY EDIT THIS VALUE*! -->
+    <project.build.outputTimestamp>2023-12-22T14:39:06Z</project.build.outputTimestamp>
+
     <!--
       ~ Common OSGi and JPMS configuration.
       ~ Don't overwrite in modules!