New appliance: AlmaLinux

[ghost]

As PR https://github.com/GNS3/gns3-registry/pull/615 is quiet for a long time, I decided to create an appliance, based on the work from @saviodsouza and the suggestion from @candlerb.

This appliance uses the official cloud image from AlmaLinux. To be usable a cloud-init ISO has to be added. I adapted the solution from https://github.com/asenci/gns3-ubuntu-cloud-init-data used by the ubuntu-cloud appliance, but stored the data in this repository in the cloud-init directory.

@grossmj Some questions:

• Do you want to use my ISO? Or do you prefer to create your own? If yes, it likely gets a different MD5.
• Is it fine to store the ISO in this repository, it's quite small? Or do you prefer to store it in SourceForge? If yes, the ISO has to be uploaded to SourceForge and in the appliance the download URL has to be adapted.
• The RockyLinux appliance is very similar to this appliance, but based on an unofficial build from linuxvmimages.com. To keep these unofficial builds to a minimum, maybe the rockylinux.gns3a should be removed.

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Before submitting a pull request, please check the following.

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When creating a new appliance:

• It's tested locally, i.e.
  • [x] You dragged an instance into a project on your box, got it installed (if necessary), and did some basic network checks (ping, UI reachable, etc.).
  • [x] GNS3 VM can run it without any tweaks.
  • [x] The device is in the right category: router, switch, guest (hosts), firewall
  • [x] You filled in as much info as possible (checks the schemas and other appliance files for some guidance).
• [ ] When adding a container: it builds on Docker Hub and can be pulled.
• [x] The filenames in the "images" section are unique (to avoid appliances and/or versions overwriting each other).
• [x] If you forked the repo, running check.py doesn't drop any errors for the new file.
• [ ] Optional: a symbol has been created for the new appliance.

[grossmj]

Do you want to use my ISO? Or do you prefer to create your own? If yes, it likely gets a different MD5.

We can use your ISO

Is it fine to store the ISO in this repository, it's quite small.

I see no problem with this, it's really small

The RockyLinux appliance is very similar to this appliance, but based on an unofficial build from linuxvmimages.com. To keep these unofficial builds to a minimum, maybe the rockylinux.gns3a should be removed.

Hum, I don't really know the difference between Alma Linux and Rocky Linux but I guess there is no harm to keep Rocky Linux excepting if you really want it to be removed of course ;)

Let me know if I can merge this PR, thanks 👍

[ghost]

The RockyLinux appliance is very similar to this appliance, but based on an unofficial build from linuxvmimages.com. To keep these unofficial builds to a minimum, maybe the rockylinux.gns3a should be removed.

Hum, I don't really know the difference between Alma Linux and Rocky Linux but I guess there is no harm to keep Rocky Linux excepting if you really want it to be removed of course ;)

Both appliances are open source versions of RHEL 8.x, so there is no big difference between them. But as both appliances don't need much attention from my side, it's OK for me to keep them both.

Let me know if I can merge this PR, thanks +1

I would be happy, if you would merge this appliance.