Add mariabackup-script

[federico-razzoli]

I hadn't the time to test this yet, but it seems fairly useful. License is GPL3 (after my request).

[dveeden]

I think this is the very early stages and might need a bit of improvements to make it easier to use and to make it a bit more resilient etc. Maybe adding it to this list could help with that.

[shlomi-noach]

The script looks legit. I think we should understand how widely this is used first? Is it commonly known? I don't think this curated list should be a platform for publishing unknown tools, but rather more to assist in finding the known and tested tools.

[shlomi-noach]

For reference, this is from the contributing guidelines:

Must be reasonably recognized and adopted. Please do not add your newly created untested scripts.
The code must have been active in some production environment and must be in a reasonably GA quality.

I'd love to understand better the state of this script as per the above.

[dveeden]

I don't think this matches that part of the guidelines.

[federico-razzoli]

My personal guess: it was made for a specific environment / use case and not contributed by others yet.

I plan to use it for customers and contribute when improvements are needed. You might close the PR and reconsider it in the future.