unable to install php8.1-zip

[mindriven]

Hey there,
thank you for providing this repository. I've spent some time playing with it, and at the moment I am failing on attempts to install zip extension.
I was trying this from withing a container:

vscode ➜ /workspace $ sudo apt-get install php8.1-zip
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package php8.1-zip
E: Couldn't find any package by glob 'php8.1-zip'
E: Couldn't find any package by regex 'php8.1-zip

I spent some time googling around, but it seems like I am missing something essential.
Thank you in advance for your help.