Ubuntu deprecation causing config-manager action failure

[Ben-Hodgkiss]

Overview
I have been working on a PR to improve the config-manager application. Unfortunately, when I merged this, the ci.yml action that automatically runs to update the app failed. This was due to the Ubuntu version in the action (20.04) being deprecated last month.

@CarlosCoelhoSL and I have tried simply upgrading the Ubuntu version to later versions (both 24.04 and 22.04) however, these cause new problems with the action running due to the upgrade - e.g. https://github.com/digital-land/config-manager/actions/runs/15048406348.

It would be useful if the action could be fixed so I can push the improvement to the config manager to reduce the number of manual calculations we are doing each week. Once the action is fixed, if we could check that this feature has gone in that would be really useful: https://github.com/digital-land/config-manager/actions/runs/15047459974

Pull Request(PR):

Tech Approach
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Acceptance Criteria/Tests
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Resourcing & Dependencies

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