feat: allow configuring openapi server url

Arnaud Vergnet requested to merge topic/default/server-openapi into branch/default

Adds a new configuration key in all-in-one.conf named api-server-name. This key allows users to specify the server name openapi should use for validation. Useful in case the CubicWeb instance runs in a sub-path and not the host root.

This key is optional and the default instance base url (using hostname+port) is used if the config is not specified.

Closes #19 (closed)

Edited by Arnaud Vergnet

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