Add virtualbox-iso target

Lots of other, small quality of life improvements to build process
Output of build serial console to artifacts upon failure
Reducing verbosity of Packer, now that serial output is captured
Fixed sizing problems with the boot partitions of Ubuntu versions
Use of Mac builders for Virtualbox targets
Updating Ubuntu builders to 22.04, as well

.github/actions/install_packer/action.yml

@@ -17,8 +17,10 @@ runs:
       if: runner.os == 'Linux'
       run: |
         set -exo pipefail
+        # Install virtualbox
         sudo apt-get update
-        sudo apt-get install -y unzip python3-{virtualenv,yaml} cloud-utils qemu-system-{x86,ppc}
+        # Install QEmu, etc
+        sudo apt-get install -y unzip python3-{virtualenv,yaml} cloud-utils xorriso qemu-system-{x86,ppc}
         # Install packer.io
         curl -O https://releases.hashicorp.com/packer/${{ inputs.version }}/packer_${{ inputs.version }}_linux_amd64.zip
         unzip -o packer_${{ inputs.version }}_linux_amd64.zip -d /usr/local/bin
@@ -31,6 +33,5 @@ runs:
       if: runner.os == 'macOS'
       run: |
         set -exo pipefail
-        brew install qemu
-        brew install pup
+        brew install pup dvdrtools xorriso coreutils gsed
         # Packer is already installed