Packer config for the boxes which can be found at https://app.vagrantup.com/russmckendrick/boxes/rocky.
To build both Virtualbox and VMWare boxes run;
packer build rocky.pkr.hcl
For just VMWare;
packer build -only vmware-iso.vmware rocky.pkr.hcl
And for Virtualbox;
packer build -only virtualbox-iso.virtualbox rocky.pkr.hcl