add sbt-reproducible-builds

Another go at apache#71/apache#80, might work now that apache#193 was fixed

build.sbt

@@ -8,13 +8,16 @@
  */
 
 import com.typesafe.sbt.packager.docker._
+import net.bzzt.reproduciblebuilds.ReproducibleBuildsPlugin.reproducibleBuildsCheckResolver
 
 ThisBuild / versionScheme := Some(VersionScheme.SemVerSpec)
 sourceDistName := "apache-pekko-persistence-cassandra"
 sourceDistIncubating := false
 
 val mimaCompareVersion = "1.0.0"
 
+ThisBuild / reproducibleBuildsCheckResolver := Resolver.ApacheMavenStagingRepo
+
 lazy val root = project
   .in(file("."))
   .enablePlugins(Common, ScalaUnidocPlugin)
@@ -27,7 +30,7 @@ dumpSchema := (core / Test / runMain).toTask(" org.apache.pekko.persistence.cass
 
 lazy val core = project
   .in(file("core"))
-  .enablePlugins(Common, AutomateHeaderPlugin, MimaPlugin, MultiJvmPlugin)
+  .enablePlugins(Common, AutomateHeaderPlugin, MimaPlugin, MultiJvmPlugin, ReproducibleBuildsPlugin)
   .dependsOn(cassandraLauncher % Test)
   .settings(
     name := "pekko-persistence-cassandra",
@@ -41,7 +44,7 @@ lazy val core = project
 
 lazy val cassandraLauncher = project
   .in(file("cassandra-launcher"))
-  .enablePlugins(Common)
+  .enablePlugins(Common, ReproducibleBuildsPlugin)
   .disablePlugins(MimaPlugin)
   .settings(
     name := "pekko-persistence-cassandra-launcher",

project/plugins.sbt

@@ -18,6 +18,7 @@ addSbtPlugin("com.github.sbt" % "sbt-dynver" % "5.0.1")
 addSbtPlugin("com.github.pjfanning" % "sbt-pekko-build" % "0.3.3")
 addSbtPlugin("com.github.pjfanning" % "sbt-source-dist" % "0.1.12")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.3")
+addSbtPlugin("net.bzzt" % "sbt-reproducible-builds" % "0.32")
 
 // Documentation
 addSbtPlugin("com.github.sbt" % "sbt-unidoc" % "0.5.0")