LUCENE-9321: Lazy evaluate project properties in the render-javadocs / changes2html task, also make URL (as its passed on command line) an input of task

gradle/documentation/changes-to-html.gradle

@@ -34,6 +34,9 @@ class ChangesToHtmlTask extends DefaultTask {
   @OutputDirectory
   File targetDir = project.file("${project.docroot}/changes")
 
+  @Input
+  def luceneDocUrl = "${->project.luceneDocUrl}"
+
   def loadVersions(File outfile) {
     // load version properties from DOAP RDF
     def prefix = "doap.${project.name}".toString()
@@ -58,7 +61,7 @@ class ChangesToHtmlTask extends DefaultTask {
         project.rootProject.file("${siteDir}/changes2html.pl").toString(),
         "${project.name}",
         versionsFile.toString(),
-        project.luceneDocUrl.concat('/')
+        luceneDocUrl.concat('/')   // slash required at end by perl script
       ]
     }
 

gradle/render-javadoc.gradle

@@ -146,10 +146,10 @@ class RenderJavadocTask extends DefaultTask {
   def offlineLinks = [:]
 
   @Input
-  def luceneDocUrl = project.luceneDocUrl
+  def luceneDocUrl = "${->project.luceneDocUrl}"
 
   @Input
-  def solrDocUrl = project.solrDocUrl
+  def solrDocUrl = "${->project.solrDocUrl}"
   
   /** Utility method to recursively collect all tasks with same name like this one that we depend on */
   private Set findRenderTasksInDependencies() {