Move externalsettings module to external repo and add to boilerplate

Move the externalsettings module from https://gitlab.developers.cam.ac.uk/uis/devops/gsuite/g-suite-authenticator/-/merge_requests/2 into a stand-alone repo and add it to this boilerplate as a dependency. Copy the plumbing from that MR to parse the EXTRA_SETTINGS_URLS environment variable.

changed milestone to %Sprint 92

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marked this issue as related to uis/devops/lecture-capture/preferences-webapp#7 (closed)

mentioned in issue uis/devops/lecture-capture/preferences-webapp#7 (closed)

Sizing as zero as agreed since this will be done by one of the blockee issues.

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assigned to @rjw57

added Development label

mentioned in commit uis/devops/django/externalsettings@2bfc9683

mentioned in merge request uis/devops/django/externalsettings!1 (merged)

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mentioned in commit uis/devops/django/externalsettings@4cf63a8a

closed via merge request uis/devops/django/externalsettings!1 (merged)

mentioned in commit uis/devops/django/externalsettings@2ad3cd33

Ooops... re-opening since I've not done the boilerplate side.

reopened

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mentioned in commit 83b6bc44

mentioned in merge request !47 (merged)

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mentioned in commit 60becf3a

mentioned in commit 9c055924

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closed via merge request !47 (merged)

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