Add new leaflet map background configuration #14682

Job	Run time
Set up docker build 'dynamic' env variables	1s
Build and check documentation	2m 53s
End-to-end tests, chromium	13m 54s
Run the Django test suite	7m 55s
End-to-end tests, firefox	16m 35s
Run the Django test suite in reverse	5m 31s
End-to-end tests, webkit	11m 52s
docker_build (production) / Build image	2m 41s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 47s
Simulate upgrading instances (2.7.4)	1m 19s
Scan docker image	2m 25s
Simulate upgrading instances (2.7.8)	1m 19s
Check for unexepected OAS changes	4s
Validate OAS	13s
Generate Postman collection from OAS	9s
Generate SDKs from OAS	29s
Push Docker image	0s
update-docker-readme	0s
	1h 10m 7s

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