Ubuntu 24.04 howdy 3.0.0 beta installation

I found many issues related to Ubuntu 24.04. However, they are messing up different howdy versions and don't solve the problem. So, I decided to create this issue and post my working solution.

1. Clone the project with version 3.0.0 beta
2. Edit `meson.options` and modify `option('install_pam_config', type: 'boolean', value: true, description: 'Install pam config file (for Debian/Ubuntu)')`. Build and install as mentioned in README. I have no idea why this isn't a default behavior.
3. `sudo howdy add`. It might give errors. Most python modules can be installed using apt except dlib.
4. `sudo pip3 install dlib --break-system-packages`. Try to add face again. It will ask you to run a script to download models. Chinese users may have network problems. Check the script and manually do that.
5. Config the camera https://github.com/boltgolt/howdy/wiki/Common-issues#error-when-trying-to-add-a-face-model
6. Now, you can add and test the face. Authentication for sudo should work now.
7. The login face recognition still has a problem. You need to manually modify `/usr/local/lib/x86_64-linux-gnu/howdy/compare.py`. Add `sys.path.append('/usr/local/lib/python3.12/dist-packages')` after the `import sys` line.
8. The new version has a GUI utility howdy-gtk. Python module `elevate` is needed which is also not provide by apt. `sudo pip3 install elevate --break-system-packages`. With `sudo howdy-gtk`, you get the following GUI:


Start with README, meson.options, and compare.py, then reproduce the Ubuntu 24.04 beta installation steps described in the issue. Check howdy add, sudo authentication, login recognition, and howdy-gtk; done means these installation and authentication paths work without the listed manual workarounds.

Written by the indexing model from the issue text.