Add a task to copy files from my resources folder to a target

Question

I have a scala js project that uses the sbt-scalajs-bundler plugin. When I run the webpack command most of the necessary files are bundled to the target/scala-2.12/scalajs-bundler/main folder. I have placed my html resources (such as index.html, myproject.css, etc) in the src/main/resources folder of my project. But these are not included in my bundle. Should I add an sbt task to copy these files and if so how would I add such a task?

My build.sbt is something like the following:

import sbt.addCommandAlias
import scalajsbundler.sbtplugin.ScalaJSBundlerPlugin.autoImport.webpackDevServerPort

enablePlugins(ScalaJSBundlerPlugin)

val scalaJSReactVersion = "1.4.1"
val reactJSVersion = "16.8.6"

lazy val myProject = project.in(file(".")).settings(

    name := "My Project",
    scalaVersion := "2.12.8",

    libraryDependencies ++= Seq(
        "org.scala-js" %%% "scalajs-dom" % "0.9.6",
        "be.doeraene" %%% "scalajs-jquery" % "0.9.4",
        "com.github.japgolly.scalajs-react" %%% "core" % scalaJSReactVersion,
        "com.github.japgolly.scalajs-react" %%% "extra" % scalaJSReactVersion,
        "com.lihaoyi" %%% "scalarx" % "0.4.0"
    ),

    npmDependencies in Compile ++= Seq(
        "react" -> reactJSVersion,
        "react-dom" -> reactJSVersion,
        "bootstrap" -> "4.3.1",
    ),

    scalaJSUseMainModuleInitializer := true,

    webpackDevServerPort := 3000

)

addCommandAlias("serve", ";fastOptJS::startWebpackDevServer;~fastOptJS")
addCommandAlias("devBuild", "fastOptJS::webpack")
addCommandAlias("build", "fullOptJS::webpack")