Document appliance upgrade proceedure when using a new appliance image

[agrare]

When upgrading to a version that necessitates a new appliance image there are a few extra steps to backup the old configuration and apply it to the new one. The upgrade to EL9 based appliances will require a new appliance image so we should document this procedure.

[Fryguy]

cc @qahmed1998

[miq-bot]

This issue has been automatically marked as stale because it has not been updated for at least 3 months.

If you can still reproduce this issue on the current release or on master, please reply with all of the information you have about it in order to keep the issue open.

[miq-bot]

This issue has been automatically marked as stale because it has not been updated for at least 3 months.

If you can still reproduce this issue on the current release or on master, please reply with all of the information you have about it in order to keep the issue open.

[miq-bot]

This issue has been automatically marked as stale because it has not been updated for at least 3 months.

If you can still reproduce this issue on the current release or on master, please reply with all of the information you have about it in order to keep the issue open.