Docker improvements and optional commands

[FoxxMD]

Makes the following changes:

Fix python version

Python fails when using 3.12, downgrade to 3.11 to fix this.

Move Requirements Installation to Runtime

The addition of /generate requires transformers and torch which adds 5GB+ to the site-packages directory due to models and other resources that need to be downloaded. This isn't an issue per se but it does mean that docker images are now 6GB+ instead of the previous ~360MB since requirements install is done during image build.

This PR moves requirements installation to docker-entrypoint.sh so that these packages are instead downloaded when the container first runs, making the image lightweight again. It also enables...

Optional /generate inclusion

As the bot hoster, and a user, I don't personally need or use /generate. My users are perfectly happy with the prompts they generate organically! However I still have to incur the downloads, slower startup due to requirements install, and 10x increase in memory usage for the application to load torch/transformers.

This PR adds the environmental variable USE_GENERATE as a string boolean (true or false). It defaults to true to maintain backward compatibility. Behavior:

• When false in docker_entrypoint
  • Uses a variant requirements_no_generate.txt for pip install to avoid downloading torch/transformers
  • Skips running python core/setup_generate.py
• When false at bot startup skips loading generatecog

Enabling me to use aiyabot without /generate and without the system requirements incurred by the needed packages.

[Kilvoctu]

Heya, I reverted the dependabot PR, but this looks like a better solution to me. I also have never used /generate. I was like, "I don't remember ever adding that", but it turns out it was someone's PR that I merged