Restart VM while building Xcode variant (#301)

* Restart VM while building Xcode variant

In an attempt to make https://github.com/actions/runner-images/issues/12948 less flaky. Xcode Release Notes at some point mentioend a first boot for another issue so let's make the VM boot twoce and do caching population just to be extra cautios.

* just `xcrun simctl list -v`

* support sonoma

templates/xcode.pkr.hcl

@@ -354,10 +354,30 @@ build {
   # [2]: https://stackoverflow.com/a/68394101/9316533
   provisioner "shell" {
     inline = [
-      "sleep 1800"
+      "source ~/.zprofile",
+      "xcrun simctl runtime dyld_shared_cache update --all || sleep 180",
+      "xcrun simctl list -v",
     ]
   }
 
+  // Restart the VM
+  provisioner "shell" {
+    inline = [
+      "sudo shutdown -r now"
+    ]
+    expect_disconnect = true
+  }
+
+  // Wait for VM to come back up and run simctl commands again
+  provisioner "shell" {
+    inline = [
+      "source ~/.zprofile",
+      "xcrun simctl runtime dyld_shared_cache update --all || sleep 180",
+      "xcrun simctl list -v"
+    ]
+    pause_before = "60s"
+  }
+
   // Install setup-info-generator
   provisioner "shell" {
     inline = [