util: Add 'swapspace' daemon to runner VM.

As these VMs, particularly the runners, don't have much memory, the
'swapspace' daemon allows for dynamic swap spaces to be created for when
more memory is required.

Change-Id: Ie8e734a8fde54e122df33dda187c6c4aafdcd006
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71680
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>

util/github-runners-vagrant/Vagrantfile-builder

@@ -20,6 +20,9 @@ Vagrant.configure("2") do |config|
   # sets up vm
   config.vm.provision :shell, path: "provision_root.sh"
   config.vm.provision :shell, privileged: false, path: "provision_nonroot.sh"
+  # To ensure we don't run out of memory, we enable dynamic Swap Space. This is
+  # done via the "swapspace" daemon: https://pqxx.org/development/swapspace/
+  config.vm.provision :shell, inline: "sudo apt install swapspace -y"
   # The provision_root.sh adds the vagrant user to the docker group, so we need to reload the VM.
   config.vm.provision :reload
   config.vm.provision :shell, run: 'always', inline: <<-SHELL

util/github-runners-vagrant/Vagrantfile-runner

@@ -20,6 +20,9 @@ Vagrant.configure("2") do |config|
   # sets up vm
   config.vm.provision :shell, path: "provision_root.sh"
   config.vm.provision :shell, privileged: false, path: "provision_nonroot.sh"
+  # To ensure we don't run out of memory, we enable dynamic Swap Space. This is
+  # done via the "swapspace" daemon: https://pqxx.org/development/swapspace/
+  config.vm.provision :shell, inline: "sudo apt install swapspace -y"
   # The provision_root.sh adds the vagrant user to the docker group, so we need to reload the VM.
   config.vm.provision :reload
   config.vm.provision :shell, run: 'always', inline: <<-SHELL