Feature/4908 json registration backend #15029

Job	Run time
Run the Django test suite	7m 37s
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 48s
End-to-end tests, chromium	13m 49s
Run the Django test suite in reverse	6m 4s
End-to-end tests, firefox	16m 29s
End-to-end tests, webkit	12m 20s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 43s
docker_build (production) / Build image	2m 47s
Simulate upgrading instances (2.8.2)	1m 26s
Scan docker image	2m 8s
Check for unexepected OAS changes	0s
Generate SDKs from OAS	0s
Generate Postman collection from OAS	0s
Validate OAS	0s
Push Docker image	0s
update-docker-readme	0s
	1h 9m 12s

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