check-remote-image-existence.yml: check remote image existence in templates

[norio-nomura]

I think it should be scheduled to run periodically with cron. What do you think?

Thanks,

[norio-nomura]

4 image locations returns 404: https://github.com/lima-vm/lima/actions/runs/10092040673/job/27904864692?pr=2513#step:3:5

Error: response: 404 for https://repo.almalinux.org/almalinux/8.9/cloud/x86_64/images/AlmaLinux-8-GenericCloud-8.9-20231128.x86_64.qcow2
Error: response: 404 for https://repo.almalinux.org/almalinux/8.9/cloud/aarch64/images/AlmaLinux-8-GenericCloud-8.9-20231128.aarch64.qcow2
Error: response: 404 for https://cloud-images.ubuntu.com/releases/22.04/release-20220902/ubuntu-22.04-server-cloudimg-amd64.img
Error: response: 404 for https://cloud-images.ubuntu.com/releases/22.04/release-20220902/ubuntu-22.04-server-cloudimg-arm64.img

annotations can be checked here: https://github.com/lima-vm/lima/pull/2513/files

[norio-nomura]

In this PR, I also believe the following should be decided:

• What to do if a 404 image is found.
  • Should we create an issue? What should the content be? What if it's not fixed by the next cron job?
• What is the appropriate cron schedule?

[afbjorklund]

For AlmaLinux, those old releases are moved to a different URL.

https://repo.almalinux.org/almalinux/8.9/README.txt

https://vault.almalinux.org/8.9/cloud/x86_64/images/

Users are not supposed to configure the minor releases directly.

it is supposed to upgrade to install 8.10 instead of 8.9:

=> https://repo.almalinux.org/almalinux/8.10/cloud/

[AkihiroSuda]

limactl validate should have this feature?

[jandubois]

limactl validate should have this feature?

I don't think limactl validate should require the user to be online, or to return different results based on network connectivity.

If that should be part of validate, then I think it should require an additional option, and be opt-in.

And then you have to figure out when you want to signal a failure (return a non-0 exit code): If one of the images don't exist? If all images don't exist? If there isn't at least one image for the current architecture? If there isn't at least one image for each architecture?

If this a feature for end-users, or just for Lima maintainers. If it is just for maintainers, then it doesn't need to be included in limactl.