Add day ahead model config

[Sukh-P]

Pull Request

Description

Changes to run a separate day ahead PVNet model, which will be deployed alongside the existing intraday PVNet ones. To run the new model a new env variable called DAY_AHEAD_MODEL will need to be added and set to "True".

Some linting has also been applied, will comment on actual changes for clarity

How Has This Been Tested?

Added a test to the test_app file

Checklist:

• [X] My code follows OCF's coding style guidelines
• [X] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] I have checked my code and corrected any misspellings

[peterdudfield]

Looks great, have your run the app locally? That might be the final step before we merge?

[Sukh-P]

Looks great, have your run the app locally? That might be the final step before we merge?

Thanks, trying to get it the tests in test_app.py to run/pass locally currently which feels like a sufficient test since this is running the app locally basically, but if you had something else in mind @peterdudfield let me know. I am running into some errors related to the NWP zarr coords (seemingly unrelated to the changes I have made) that the CI doesn't seem to encounter so just digging into why that is