misc(test): use ubuntu minimal cloud image in tests

[hsnprsd]

Contributor's Note

• I have added / updated documentation in /docs for any user-facing features or additions.
• I have added / updated acceptance tests in /fwprovider/tests for any new or updated resources / data sources.
• I have ran make example to verify that the change works as expected.

Proof of Work

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Closes #0000 | Relates #0000

[hsnprsd]

My life would be simpler with a leaner cloud image. 😆

[shamilovstas]

Maybe something similar can be done for lxc tests as well? Containers use templates from http://download.proxmox.com and there are no minimal builds for Ubuntu there, but maybe it is possible to use Alpine templates instead? Its ~140 MB -> ~ 3 MB size reduction

[bpg]

Good call updating the tests!

Not sure about the changes in docs and guides tho. People come here from different backgrounds, and many may start with copy/pasting an example, which may not produce a VM they expect.

Also I remember some issues in 22.04 vs 24.04 around cloud-init and/systemd behaviour in new versions, some examples might require additional adjustments, like adding serial device, or something.
Need to double check them to make sure they all still work before releasing this. @hsnprsd not sure if you ran them, proof of work of the PR doesn't say anything 🤷🏼

[hsnprsd]

I ran several tests, but not all of them—I don’t remember exactly which ones :). I’m fine with reverting the documentation changes.