Allow admin UI base path customization in config

[moselhy]

Added (or rather uncommented) a config variable to set the admin UI base path and set the conf accordingly in createAdminUIMiddleware.ts. Thanks to @thekarinka for help in making this work!

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Name	Type
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@keystone-6/auth	Major
@keystone-6/cloudinary	Major
@keystone-6/fields-document	Major
@keystone-6/session-store-redis	Major
@keystone-6/example-auth	Patch
@keystone-6/examples-app-basic	Patch
@keystone-6/example-ecommerce	Patch
@keystone-6/example-graphql-api-endpoint	Patch
@keystone-6/example-roles	Patch
@keystone-6/example-sandbox	Patch
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[dcousens]

Related https://github.com/keystonejs/keystone/discussions/5804

[acburdine]

I haven't tested this yet, but wouldn't there also need to be changes made to the nextjs build step for the admin ui?

from the nextjs basePath docs:

Note: this value must be set at build time and can not be changed without re-building as the value is inlined in the client-side bundles.

[raveling]

Quick note to say we're looking into this. It's not highest priority, but we know many in the community would like to see this unlocked.

[Pei116]

Bump here +1

[beemstream]

Really would be useful to have this rather than find a hacky workaround

[glani]

Really would be useful to have this rather than find a hacky workaround

I have the same issue. What workaround do you use ? I see only one to deploy to a dedicated domain. I want to extended express server to serve angular application close to the backend (keystonejs)

[junaid33]

Bump +1

[dcousens]

Replaced by https://github.com/keystonejs/keystone/pull/8545, unfortunately this change wasn't so subtle and required additional testing and development to ensure compatibility with existing projects.

Thanks @moselhy for starting the feature :yellow_heart: