Add multi CSI support summary and csi-driver-config setting

[LucasSaintarbor]

References harvester/harvester#2405, harvester/harvester#3666

Documents multi CSI support on StorageClass page and explains how to edit the new csi-driver-config setting

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[futuretea]

LGTM, thanks. Just need to squash commits

[lanfon72]

#3666 also introduce:

• Add a new option os.persistent_state_paths to the Harvester OS configuration.
• Add a new option os.after_install_chroot_commands to the Harvester OS configuration.

Both would need to add into install/harvester-configuration.md

[LucasSaintarbor]

#3666 also introduce:

• Add a new option os.persistent_state_paths to the Harvester OS configuration.
• Add a new option os.after_install_chroot_commands to the Harvester OS configuration.

Both would need to add into install/harvester-configuration.md

@lanfon72 I added os.persistent_state_paths and os.after_install_chroot_commands to install/harvester-configuration.md. Not sure where to add these to the new options in ## Configuration Example, may you update the config example + review to the definition and example for each option? Thanks!

[lanfon72]

Thank you @LucasSaintarbor, it looks good enough for me. 😸 I think it should be fine to not update the content of Configuration Example, both configure options are optional.

For os.after_install_chroot_commands, was tested in #harvester/3689, and there have a caveat that the nameserver might not available, so user would need to update /etc/resolv.conf manually while using the configure option to install package with URL. ¹

Footnotes

1. https://github.com/harvester/harvester/issues/3689#issuecomment-1563130124 ↩

[futuretea]

@LucasSaintarbor Thanks! This note https://github.com/harvester/harvester/blob/master/enhancements/20230316-multi-csi-support.md?plain=1#L137 also need to be included.

[LucasSaintarbor]

@futuretea Added the note you referenced for making changes persistent across an upgrade (#372 (comment))

@lanfon72 Added info and example about accessing a domain name to install package using an URL (#372 (comment))

PTAL, thanks!

[lanfon72]

LGTM, thanks

[jeff-radick-suse]

I've modified the content and pushed a few commits. There was some description of the procedure that was clumsy and which is now simplified, and some important stuff that was missing. I tried to follow the formatting changes but I'm not sure I have it right. At any rate the semantic content is complete as far as I can tell, as long as no reviewers find errors.