chore: specify number of CPU cores

Author: darora

qemu-arm64-nix.pkr.hcl

@@ -68,19 +68,19 @@ build {
 
 source "qemu" "cloudimg" {
   boot_wait      = "2s"
-  cpus           = 12
+  cpus           = 8
   disk_image     = true
   disk_size      = "15G"
   format         = "qcow2"
   headless       = true
   http_directory = "http"
   iso_checksum   = "file:https://cloud-images.ubuntu.com/focal/current/SHA256SUMS"
   iso_url        = "https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-arm64.img"
-  memory         = 20000
+  memory         = 40000
   qemu_binary    = "qemu-system-aarch64"
   qemuargs = [
     ["-machine", "virt"],
-    ["-cpu", "host"],
+    # ["-cpu", "host"],
     ["-device", "virtio-gpu-pci"],
     ["-drive", "if=pflash,format=raw,id=ovmf_code,readonly=on,file=/usr/share/AAVMF/AAVMF_CODE.fd"],
     ["-drive", "if=pflash,format=raw,id=ovmf_vars,file=AAVMF_VARS.fd"],