build.sbt snippet for building with https://www.scala-sbt.org/sbt-native-packager/formats/docker.html

build.sbt

/*
   project/sbt-native-packager.sbt:
      addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.3.23")
*/

// ...

// BASE IMAGE
dockerBaseImage := "openjdk:8-jre-slim-stretch"
 
// SBT DOCKER BUILD PLUGIN CONFIGURATION
dockerVersion := Some(DockerVersion(18, 6, 3, Some("ce")))
 
// IMAGE LABELS
dockerLabels := Map("version" -> version.value,
                    "base_image" -> dockerBaseImage.value,
                    "owner_team" -> "PUT_YOUR_TEAM_NAME_HERE",
                    "build_id" -> Option(System.getProperty("build_id")).getOrElse("NA")
                   )
 
// IMAGE ENV
dockerEnvVars := Map("SERVICE_NAME" -> "xxx",
                     "SERVICE_TAGS" -> "yyy,zzz"
                     )

// APPLY SECURITY UPDATES
lazy val serviceUserGroup = Def.setting(
  (daemonUserUid in Docker).value.getOrElse((daemonUser in Docker).value)
  ++ ":" ++ (daemonGroupGid in Docker).value.getOrElse((daemonGroup in Docker).value))
dockerCommands := dockerCommands.value ++ Seq(
  Cmd("USER", "root"),
  Cmd("RUN",
      "if test -f /etc/alpine-release; then apk upgrade --no-cache -v; apk add --no-cache bash; fi;"
   ++ "if test -f /etc/debian_version; then apt-get update && apt-get upgrade -y && rm -rf /var/lib/apt/lists/* ; fi;"
  ),
  Cmd("USER", serviceUserGroup.value)
)

// ...