📝 [#3283] Document registration backend migration procedure #14887

Job	Run time
Run the Django test suite in reverse	5m 35s
Build and check documentation	4m 11s
End-to-end tests, chromium	13m 21s
Run the Django test suite	7m 52s
End-to-end tests, firefox	16m 11s
End-to-end tests, webkit	12m 31s
Set up docker build 'dynamic' env variables	1s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 47s
docker_build (production) / Build image	2m 44s
Simulate upgrading instances (2.7.4)	1m 30s
Simulate upgrading instances (2.7.8)	1m 19s
Scan docker image	2m 10s
Check for unexepected OAS changes	4s
Validate OAS	12s
Generate SDKs from OAS	32s
Generate Postman collection from OAS	13s
Push Docker image	0s
update-docker-readme	0s
	1h 11m 13s

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