title: Add a directory into a docker image using sbt (on Lagom 1.4)
body: <p>can someone help with how to add a file system folder into a docker image... e.g. I want to add /opt/app/conf into the docker image at path /opt/docker/conf. A snippet of the build.sbt is as follows:</p>
  
  <pre><code>dockerCommands :=
    dockerCommands.value.flatMap {
      case cmd@Cmd("FROM", ) =&gt; List(cmd, Cmd("RUN", "apk add --no-cache bash"))
      case ExecCmd("ENTRYPOINT", args @ *) =&gt; Seq(Cmd("ENTRYPOINT", args.mkString(" ")))
      case v =&gt; Seq(v)
  },
  </code></pre>