It looks like the packages fileinfo and simplexml are missing. Note that they are available here, but are compiled against a different version of PHP 8.1.x" - https://pkgs.alpinelinux.org/package/edge/testing/x86_64/php81-simplexml - https://pkgs.alpinelinux.org/package/edge/testing/x86_64/php81-fileinfo
It looks like the packages fileinfo and simplexml are missing.
Note that they are available here, but are compiled against a different version of PHP 8.1.x"