Mbstring is such a popular PHP extension that it is used everywhere and most libraries don't work without it. It can be compiled directly with PHP.
The official Docker images of PHP include it.
* test updates to adopt https://github.com/devcontainers/cli/pull/124
* remove accidental tgz check in
* typo in option
* typo in python install script on dotnet6/jammy branch
* no scenarios
* code review and test name
* Delete install_os_provided_python.sh
