Use adoptopenjdk replacement temurin base image (#2974)

Author: cwholmes

build.sbt

@@ -332,7 +332,7 @@ lazy val metadataSettings = Def.settings(
 
 lazy val dockerSettings = Def.settings(
   dockerBaseImage := Option(System.getenv("DOCKER_BASE_IMAGE"))
-    .getOrElse("adoptopenjdk/openjdk11:alpine"),
+    .getOrElse("eclipse-temurin:11-alpine"),
   dockerCommands ++= {
     val binDir = "/usr/local/bin"
     val sbtVer = sbtVersion.value
@@ -343,12 +343,18 @@ lazy val dockerSettings = Def.settings(
     val millUrl =
       s"https://github.com/lihaoyi/mill/releases/download/${millVer.split("-").head}/$millVer"
     val coursierBin = s"$binDir/coursier"
+    val installScalaCliStep = Seq(
+      "wget -q -O scala-cli.gz https://github.com/Virtuslab/scala-cli/releases/latest/download/scala-cli-x86_64-pc-linux-static.gz",
+      "gunzip scala-cli.gz",
+      "chmod +x scala-cli",
+      "mv scala-cli /usr/bin/"
+    ).mkString(" && ")
     Seq(
       Cmd("USER", "root"),
       Cmd("RUN", "apk --no-cache add bash git ca-certificates curl maven openssh nodejs npm"),
       Cmd("RUN", s"wget $sbtUrl && tar -xf $sbtTgz && rm -f $sbtTgz"),
       Cmd("RUN", s"curl -L $millUrl > $millBin && chmod +x $millBin"),
-      Cmd("RUN", "curl -sSLf https://virtuslab.github.io/scala-cli-packages/scala-setup.sh | sh"),
+      Cmd("RUN", installScalaCliStep),
       Cmd("RUN", s"curl -L https://git.io/coursier-cli > $coursierBin && chmod +x $coursierBin"),
       Cmd("RUN", s"$coursierBin install --install-dir $binDir scalafix scalafmt"),
       Cmd("RUN", "npm install --global yarn")