allow custom setup for ES, plus Docker build

build.sbt

@@ -1,4 +1,4 @@
-enablePlugins(DebianPlugin, JavaServerAppPackaging, SystemdPlugin)
+enablePlugins(DebianPlugin, JavaServerAppPackaging, SystemdPlugin, DockerPlugin, AshScriptPlugin)
 
 ThisBuild / version := "0.1.0"
 
@@ -14,6 +14,7 @@ val prometheusVersion = "0.16.0"
 lazy val root = (project in file("."))
   .settings(
     name := "concierge-graphql",
+    dockerBaseImage := "amazoncorretto:17-alpine",
     libraryDependencies ++= Seq(
       "org.http4s" %% "http4s-core" % "0.23.21",
       "org.http4s" %% "http4s-dsl" % "0.23.21",
@@ -48,3 +49,4 @@ lazy val root = (project in file("."))
       "io.netty" % "netty-codec-http" % "4.1.94.Final",
     )
   )
+

src/main/scala/ElasticSearchResolver.scala

@@ -0,0 +1,16 @@
+import com.sksamuel.elastic4s.ElasticNodeEndpoint
+
+object ElasticSearchResolver {
+  private def local = Option(ElasticNodeEndpoint("http","localhost",9200, None))
+  private def fromEnvironment = {
+    Option(System.getenv("ELASTICSEARCH_HOST")).map(host=>{
+      val proto = if(System.getenv("ELASTICSEARCH_HTTPS")==null) "http" else "https"
+      val port = Option(System.getenv("ELASTICSEARCH_PORT")).map(_.toInt).getOrElse(9200)
+      ElasticNodeEndpoint(proto, host, port, Option(System.getenv("ELASTICSEARCH_PREFIX")))
+    })
+  }
+
+  def resolve():ElasticNodeEndpoint = {
+    fromEnvironment orElse local
+  }.get
+}

src/main/scala/Main.scala

@@ -19,7 +19,7 @@ import scala.concurrent.duration._
 object Main extends IOApp {
   private val logger = LoggerFactory.getLogger(getClass)
   DefaultExports.initialize()
-  val documentRepo = new ElasticsearchRepo(ElasticNodeEndpoint("http","localhost",9200, None))
+  val documentRepo = new ElasticsearchRepo(ElasticSearchResolver.resolve())
   val server = new GraphQLServer(documentRepo)
 
   val graphqlService = HttpRoutes.of[IO] {