Another php8.1 upgrade

[matidau]

This is my take on upgrading to PHP 8.1 with the feedback from @kiekerjan's PR #2309.

Would probably like to move the PHP Version from the if on line 94 in nextcloud.sh and make it an additional mandatory argument for the InstallNextcloud() function. But to keep this PR simple initially I have foregone that.

• this has explicit PHP version as requested in Migrate from php8.0 to php8.1 #2309 (comment) and Migrate from php8.0 to php8.1 #2309 (comment)
• have not made use of docker Upgrade to php8.1 and upgrade old nextcloud versions using docker #2319
• not modifying the nextcloud package Migrate from php8.0 to php8.1 #2309 (comment)

I have tested this with upgrading from a v57a backup (nextcloud 20.0.14) successfully.

[binarykitchen]

Just double-checking, there are no backward incompatible changes between v8.0 and v8.1 in our repo?
https://www.php.net/manual/en/migration81.incompatible.php

[binarykitchen]

+1 from me

[matidau]

Just double-checking, there are no backward incompatible changes between v8.0 and v8.1 in our repo? https://www.php.net/manual/en/migration81.incompatible.php

These are covered in the individual packages.

Roundcube 1.6 introduced PHP 8.1 and is backwards compatible with 8.0.

Z-Push 2.7.1 Fixed the only PHP 8.1 specific issue that has been come across. There is still PHP 8.0 errors coming up and being fixed though. 2.7.4 has some more of these. Z-Push will be aiming to maintain PHP 7.4 to latest PHP.

I don't think there are any problems with moving to 8.1.

[binarykitchen]

Great, thanks. Will leave it to @JoshData to review + merge, then I will do the next part, the NC upgrade.