UKCA test suite port to git

[James Bruten (james-bruten-mo)]

This sets up the UKCA test suite to run using git sources. The primary changes are to the extraction of the code. This uses central scripts stored in SimSys_Scripts. This PR also removes the umdp3_checker which is also now centrally installed in SimSys_Scripts.

It's been tested at meto and on the VM. The meto trac.log is below:

Test Suite Results - ukca - ukca_git/run2

Suite Information

Item	Value
Suite Name	ukca_git/run2
Suite User	james.bruten
Workflow Start	2025-10-31T11:08:32
Groups Run	scripts

Dependency	Reference	Main Like
SimSys_Scripts	MetOffice/SimSys_Scripts@main	True
ukca	james-bruten-mo/ukca@ukca_git_test	False

Task Information

✅ succeeded tasks - 2

Task	State
extract_source	succeeded
umdp3_checker	succeeded

[James Bruten (james-bruten-mo)]

Sorry if you've started looking, just done a minor further commit

[Pierre Siddall (Pierre-siddall)]

This mostly looks good on my end of things and thank you for paying attention to use f-strings instead of .format() . Just a couple of really tiny suggestions from my end regarding raising slightly more informative errors, I think it would be good to raise these errors to help developer debug any issues they would get further on down the line.

[Pierre Siddall (Pierre-siddall)]

Suggested change

	raise Exception('Could not determine the HEAD commit.')
	raise RuntimeError('Could not determine the HEAD commit.')

Similarly, here I'd raise a runtime error as the if statement verifies whether the process has finished.

[James Bruten (james-bruten-mo)]

Thanks Pierre. For the get_site function I'm not sure this is a value error, so I'm going to leave it as it is.
The get_git_ref one should be changed, but I've just removed that function as I probably shouldn't have left it in. It was an early attempt at interacting with a clone, but not used anymore.

[Pierre Siddall (Pierre-siddall)]

Thanks Pierre. For the get_site function I'm not sure this is a value error, so I'm going to leave it as it is. The get_git_ref one should be changed, but I've just removed that function as I probably shouldn't have left it in. It was an early attempt at interacting with a clone, but not used anymore.

Yeah that makes sense I though ValueError would be a stretch but I thought I'd jot it down in the review just in case. With this being said everything else looks good so I'm happy to approve this.

[Pierre Siddall (Pierre-siddall)]

This looks good to go to me now :) .

[James Bruten (james-bruten-mo)]

Thanks Pierre, I missed an import of the deleted function, so just removed that

[Erica Neininger (ericaneininger)]

All good. One minor typo-in-a-comment suggestion :)

[Erica Neininger (ericaneininger)]

Thanks, happy to approve.