Prepare release 3.0.0 #14966

Job	Run time
End-to-end tests, chromium	13m 37s
Run the Django test suite	8m 25s
End-to-end tests, firefox	16m 16s
End-to-end tests, webkit	12m 29s
Run the Django test suite in reverse	5m 45s
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 54s
docker_build (production) / Build image	2m 42s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 42s
Scan docker image	2m 20s
Simulate upgrading instances (2.7.4)	1m 19s
Simulate upgrading instances (2.7.8)	1m 20s
Check for unexepected OAS changes	5s
Generate Postman collection from OAS	0s
Validate OAS	0s
Generate SDKs from OAS	0s
Push Docker image	0s
update-docker-readme	0s
	1h 10m 55s

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