Support `bzip2` decompression algorithm in `pve_download_file`

[jmuchovej]

Is your feature request related to a problem? Please describe. Yes. bzip2 compressed ISOs cannot be downloaded/used to complete the full VM creation pipeline via Terraform. (Here's a link to the OPNSense ISO I was trying to use.)

Describe the solution you'd like Clarity on whether the limitations of decompression_algorithm are imposed by the provider or the Proxmox API? (Perusing the Proxmox API, it seems like the API doesn't impose such limitations? It also appears that Go natively supports bzip2 [de]compression?)

Describe alternatives you've considered There aren't really any? OPNSense only appears to ship bz2 image files and I'm not going to rebuild the provider from scratch just to support this. 😅

I'm happy to contribute, but I'm a Go novice and am unsure where the decompression is handled, based on download_url.go – perhaps Proxmox itself does this?

[jmuchovej]

Ah! I didn't realize that this was actually limited by Proxmox! Feel free to close.

[bpg]

Yeah, that's the PVE limitation.