write info.apiURL to ivy.xml

Ref https://github.com/coursier/coursier/issues/1123

main/src/main/scala/sbt/internal/LMCoursier.scala

@@ -38,16 +38,22 @@ private[sbt] object LMCoursier {
 
   def coursierProjectTask: Def.Initialize[sbt.Task[CProject]] =
     Def.task {
-      Inputs.coursierProject(
+      val auOpt = apiURL.value
+      val proj = Inputs.coursierProject(
         projectID.value,
         allDependencies.value,
         excludeDependencies.value,
-        // should projectID.configurations be used instead?
         ivyConfigurations.value,
         scalaVersion.value,
         scalaBinaryVersion.value,
         streams.value.log
       )
+      auOpt match {
+        case Some(au) =>
+          val props = proj.properties :+ ("info.apiURL" -> au.toString)
+          proj.copy(properties = props)
+        case _ => proj
+      }
     }
 
   def coursierConfigurationTask(

main/src/main/scala/sbt/internal/librarymanagement/IvyXml.scala

@@ -91,10 +91,11 @@ object IvyXml {
       }
     )
 
-    val infoAttrs = project.module.attributes.foldLeft[xml.MetaData](xml.Null) {
-      case (acc, (k, v)) =>
-        new PrefixedAttribute("e", k, v, acc)
-    }
+    val infoAttrs =
+      (project.module.attributes.toSeq ++ project.properties).foldLeft[xml.MetaData](xml.Null) {
+        case (acc, (k, v)) =>
+          new PrefixedAttribute("e", k, v, acc)
+      }
 
     val licenseElems = project.info.licenses.map {
       case (name, urlOpt) =>