Env variable for image_core url

[croche2574]

Allows for setting the url for image_core to something other than localhost, useful for setting up unraid containers for the individual applications

[croche2574]

Added the rest of the necessary changes to set up the containers with unraid, made some small edits to the build yml for pro (can be ignored), added a build script for the image to text generator docker image including a command that ensures enough room exists to finish the build

[neonwatty]

Thanks for contributing!

A few comments regarding the updates!

• .github/workflows/image-to-text-build.yml: in my testing the current image-to-text image is too large for github's free runner - can you verify this? At present this is because the model weights are included in the image - making the experience "batteries included" by just pulling the image. (In the future we could certainly de-couple and not bake the weights in - especially if additional models are included giving users options - maybe we should do that?)

• regarding replacing localhost with an env variable: no issue with the idea, but making this adjustment creates additional cascading required updates like

1. the path should default back to localhost if no HOST_IP or HOST_URL variable is set by the user
2. variables should not be set by hand, and should be stored in an .env file would - which would require appropriate additions be made in both containers (e.g., dotenv in the case of Python is needed to hoist variables)
3. updates to the docker-compose files