Make more intelligent use of the cache

Bust cache on the dynamic files
Use the cached builds for both virtualbox and Hyper-V
Hopefully improve loop downloading files to cache

distros/centos-stream/8/amd64.pkrvars.hcl.sh

@@ -27,3 +27,5 @@ boot_command = [
 cd_files = [ "distros/centos-stream/8/disc/*" ]
 vbox_os_type = "RedHat8_64"
 HERPDERP
+
+rm -f cache/CentOS-Stream-8-x86_64-latest-boot.iso

distros/centos-stream/9/amd64.pkrvars.hcl.sh

@@ -28,4 +28,6 @@ boot_command = [
 ]
 cd_files = [ "distros/centos-stream/9/disc/*" ]
 vbox_os_type = "RedHat9_64"
-HERPDERP
+HERPDERP
+
+rm -f cache/CentOS-Stream-9-latest-x86_64-boot.iso

distros/debian/11/amd64.pkrvars.hcl

@@ -1,8 +1,8 @@
 distro  = "debian"
 version = "11"
 iso = {
-  url      = "http://cdimage.debian.org/cdimage/archive/11.8.0/amd64/iso-cd/debian-11.8.0-amd64-netinst.iso"
-  checksum = "d7a74813a734083df30c8d35784926deaa36bc41e5c0766388e9f591ab056b72"
+  url      = "https://cdimage.debian.org/cdimage/archive/11.9.0/amd64/iso-cd/debian-11.9.0-amd64-netinst.iso"
+  checksum = "01c540225250d42cda3809d7130d0c27e934c8aca260d01a86d33dee19623b0f"
 }
 boot_command = [
  "<down>e<wait><down><down><down><end><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",

distros/fedora/rawhide/amd64.pkrvars.hcl.sh

@@ -44,3 +44,4 @@ vbox_os_type = "Fedora_64"
 EOF
 
 rm -r "${tmp}"
+rm -f "cache/${iso_name}"

distros/nixos/23.05/amd64.pkrvars.hcl.sh

@@ -38,3 +38,4 @@ boot_wait = "60s"
 EOF
 
 rm -r "${tmp}"
+rm -f "cache/latest-nixos-minima-x86_64-linux.iso"

distros/nixos/23.11/amd64.pkrvars.hcl.sh

@@ -38,3 +38,4 @@ boot_wait = "60s"
 EOF
 
 rm -r "${tmp}"
+rm -f "cache/latest-nixos-minimal-x86_64-linux.iso"