SBT: update native build to JDK21

As described here:
https://github.com/graalvm/setup-graalvm?tab=readme-ov-file#migrating-from-graalvm-223-or-earlier-to-the-new-graalvm-for-jdk-17-and-later

.github/workflows/ci.yml

@@ -110,27 +110,25 @@ jobs:
           - os: macOS-latest
             artifact: scalafmt-macos
             env:
-              NATIVE_IMAGE_STATIC: false
+              NATIVE_IMAGE_STATIC: none
           - os: ubuntu-latest
             libc: default
             artifact: scalafmt-linux-glibc
             env:
-              NATIVE_IMAGE_STATIC: true
+              NATIVE_IMAGE_STATIC: nolibc
           - os: ubuntu-latest
             libc: musl
             artifact: scalafmt-linux-musl
             env:
-              NATIVE_IMAGE_STATIC: true
-              NATIVE_IMAGE_MUSL: true
+              NATIVE_IMAGE_STATIC: musl
     env: ${{ matrix.env }}
     steps:
       - uses: actions/checkout@v4
       - name: Set up GraalVM
         uses: graalvm/setup-graalvm@v1
         with:
-          version: '22.3.0'
-          java-version: '11'
-          components: 'native-image'
+          java-version: '21'
+          distribution: 'graalvm-community'
           native-image-musl: ${{ matrix.libc == 'musl' }}
           github-token: ${{ secrets.GITHUB_TOKEN }}
       - uses: sbt/setup-sbt@v1

build.sbt

@@ -198,15 +198,19 @@ lazy val cli = crossProject(JVMPlatform, NativePlatform)
     ),
     scalacOptions ++= scalacJvmOptions.value,
     Compile / mainClass := Some("org.scalafmt.cli.Cli"),
-    nativeImageVersion := "22.3.0",
     nativeImageInstalled := isCI,
     nativeImageOptions ++= {
-      val isMusl = sys.env.get("NATIVE_IMAGE_MUSL").exists(_.toBoolean)
-      if (isMusl) Seq("--libc=musl") else Nil
-    },
-    nativeImageOptions ++= {
-      val isStatic = sys.env.get("NATIVE_IMAGE_STATIC").exists(_.toBoolean)
-      if (isStatic) Seq("--static") else Nil
+      // https://www.graalvm.org/22.3/reference-manual/native-image/guides/build-static-executables/
+      // https://www.graalvm.org/latest/reference-manual/native-image/guides/build-static-executables/
+      sys.env.get("NATIVE_IMAGE_STATIC") match {
+        case Some("nolibc") => Seq(
+            "-H:+UnlockExperimentalVMOptions",
+            "-H:+StaticExecutableWithDynamicLibC",
+            "-H:-UnlockExperimentalVMOptions",
+          )
+        case Some("musl") => Seq("--static", "--libc=musl")
+        case _ => Nil
+      }
     },
   ).nativeSettings(scalaNativeConfig).dependsOn(core, dynamic)
   .enablePlugins(NativeImagePlugin)

scalafmt-cli/shared/src/main/resources/META-INF/native-image/org.scalafmt/scalafmt-cli/native-image.properties

@@ -4,9 +4,13 @@ Args=--no-server \
   --enable-http \
   --enable-https \
   --install-exit-handlers \
-  --initialize-at-build-time \
-  --initialize-at-run-time=org.scalafmt.util.AbsoluteFile \
+  --strict-image-heap \
+  -march=native \
+  --initialize-at-build-time="org.scalafmt" \
+  --initialize-at-build-time="org.scalameta" \
+  --initialize-at-build-time="scala.meta" \
   --report-unsupported-elements-at-runtime \
-  -H:EnableURLProtocols=http,https \
+  -H:+UnlockExperimentalVMOptions \
   -H:+RemoveSaturatedTypeFlows \
-  -H:+ReportExceptionStackTraces
+  -H:+ReportExceptionStackTraces \
+  -H:-UnlockExperimentalVMOptions