Update GraalVM to 21.3.0, use Java 17 GraalVM

But keep using GraalVM 21.2.0 on Windows (weird dead lock on CI)

project/deps.sc

@@ -1,5 +1,7 @@
 import mill._, scalalib._
 
+import scala.util.Properties
+
 object Scala {
   def scala212  = "2.12.15"
   def scala213  = "2.13.6"
@@ -90,16 +92,21 @@ object Deps {
   def usingDirectives          = ivy"org.virtuslab:using_directives:0.0.7-4f0dd5d-SNAPSHOT"
 }
 
-private def graalVmVersion = "21.2.0"
-def graalVmJvmId = s"graalvm-java11:$graalVmVersion"
+private def graalVmVersion =
+  if (Properties.isWin) "21.2.0"
+  else "21.3.0"
+def graalVmJvmId =
+  if (Properties.isWin) s"graalvm-java16:$graalVmVersion"
+  else s"graalvm-java17:$graalVmVersion"
 
 def csDockerVersion = Deps.Versions.coursier
 
 def buildCsVersion = Deps.Versions.coursier
 
 object Docker {
+  def customMuslBuilderImageName = "scala-cli-base-musl"
   def muslBuilder =
-    "messense/rust-musl-cross@sha256:12d0dd535ef7364bf49cb2608ae7eaf60e40d07834eb4d9160c592422a08d3b3"
+    s"$customMuslBuilderImageName:latest"
 
   def testImage = "ubuntu:18.04"
   def alpineTestImage =

project/musl-image/Dockerfile

@@ -0,0 +1,3 @@
+FROM messense/rust-musl-cross@sha256:47a3721b3e186abfd705feb1e03bf1d5212357ea26762cceef11530e0a2f2c7c
+ADD setup.sh /setup.sh
+RUN /setup.sh

project/musl-image/setup.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+set -e
+
+cd /usr/local/musl/bin
+
+for i in x86_64-unknown-linux-musl-*; do
+  dest="$(echo "$i" | sed 's/-unknown//')"
+  ln -s "$i" "$dest"
+done

project/settings.sc

@@ -312,6 +312,20 @@ trait CliLaunchers extends SbtModule { self =>
         s"https://github.com/coursier/coursier/releases/download/v${deps.csDockerVersion}/cs-x86_64-pc-linux.gz"
       )
     )
+    def nativeImageOptions = T {
+      super.nativeImageOptions() ++ Seq(
+        "-H:-CheckToolchain"
+      )
+    }
+    def buildHelperImage = T {
+      os.proc("docker", "build", "-t", Docker.customMuslBuilderImageName, ".")
+        .call(cwd = os.pwd / "project" / "musl-image", stdout = os.Inherit)
+      ()
+    }
+    def nativeImage = T {
+      buildHelperImage()
+      super.nativeImage()
+    }
   }
 
   object `mostly-static-image` extends CliNativeImage {