Produce a BOM for Akka libraries (#29839)

project/Publish.scala

@@ -17,30 +17,24 @@ object Publish extends AutoPlugin {
   override def trigger = allRequirements
 
   override lazy val projectSettings = Seq(
-    pomExtra := akkaPomExtra,
     publishTo := Some(akkaPublishTo.value),
     publishRsyncHost := "akkarepo@gustav.akka.io",
     credentials ++= akkaCredentials,
     organizationName := "Lightbend Inc.",
     organizationHomepage := Some(url("https://www.lightbend.com")),
+    startYear := Some(2009),
+    developers := List(
+        Developer(
+          "akka-contributors",
+          "Akka Contributors",
+          "akka.official@gmail.com",
+          url("https://github.com/akka/akka/graphs/contributors"))),
     publishMavenStyle := true,
     pomIncludeRepository := { x =>
       false
     },
     defaultPublishTo := target.value / "repository")
 
-  def akkaPomExtra = {
-    <inceptionYear>2009</inceptionYear>
-    <developers>
-      <developer>
-        <id>akka-contributors</id>
-        <name>Akka Contributors</name>
-        <email>akka.official@gmail.com</email>
-        <url>https://github.com/akka/akka/graphs/contributors</url>
-      </developer>
-    </developers>
-  }
-
   private def akkaPublishTo = Def.setting {
     val key = new java.io.File(
       Option(System.getProperty("akka.gustav.key"))

project/plugins.sbt

@@ -9,6 +9,7 @@ addSbtPlugin("com.typesafe.sbt" % "sbt-multi-jvm" % "0.4.0")
 //#sbt-multi-jvm
 
 addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.6.0")
+addSbtPlugin("com.lightbend.sbt" % "sbt-bill-of-materials" % "1.0.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.2")
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.23")
 // sbt-osgi 0.9.5 is available but breaks including jdk9-only classes