Add new leaflet map background configuration #14681

Job	Run time
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 4s
End-to-end tests, chromium	2m 34s
End-to-end tests, firefox	3m 12s
End-to-end tests, webkit	3m 8s
Run the Django test suite	3m 13s
Run the Django test suite in reverse	3m 32s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 43s
docker_build (production) / Build image	2m 47s
Scan docker image	2m 25s
Simulate upgrading instances (2.7.4)	1m 36s
Simulate upgrading instances (2.7.8)	1m 25s
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
	29m 40s

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