packer-rocm/repos: +dir for overrides, bool for GA-optout

[joshlay2amd]

It may be preferable to add more repositories to the image. Not just for certain amdgpu or ROCm releases... but any software at all.

To that end, introduce the repositories directory. Any .repo or .list files that apply for the given OS family will be copied to the builder VM. Example:

# file: ADA/packer-rocm/repositories/amdgpu.list
deb [ trusted=yes ] http://artifactory.domain.tld/artifactory/list/repository-name/ jammy/6.3 amdgpu-pro

For the specific amdgpu/ROCm use-case, the rocm_repos variable has been introduced. This may be used to opt out of the GA repositories at repo.radeon.com.

[joshlay2amd]

I was able to craft an image with a test amdgpu release from another repository. Looks good.

Holding for one more change: configurable package name for amdgpu. Will allow - but not require - specifying the build number

[joshlay2amd]

Can specify the build number; built/deployed an image with a release published to a private repository, selected from three weeks ago.

Now testing the conventional/unspecified case for regression. Should still be able to produce GA images with no variables or custom repositories.

[joshlay2amd]

Testing looks good; with no repository override or changes to the amdgpu/rocm package requests, the GA driver was pulled:

~/ADA $ tar xvf packer-rocm/packer-maas/ubuntu/ubuntu-rocm.tar.gz ./var/lib/dpkg/info/amdgpu-dkms.list ./var/lib/dpkg/info/amdgpu-core.md5sums
./var/lib/dpkg/info/amdgpu-dkms.list
./var/lib/dpkg/info/amdgpu-core.md5sums
~/ADA $ grep -m3 src ./var/lib/dpkg/info/amdgpu-dkms.list
/usr/src
/usr/src/amdgpu-6.8.5-2044426.22.04
/usr/src/amdgpu-6.8.5-2044426.22.04/amd

Can be merged as-is, letting this sit for a moment longer in case inspiration hits. Outside review/suggestion is welcome

edit: inspiration landed - locking this in to start working on the next effort: package requirements being renamed. Not yet clear to which releases this will apply