Add new leaflet map background configuration #14777

Job	Run time
Build and check documentation	4m 3s
Run the Django test suite in reverse	5m 27s
Set up docker build 'dynamic' env variables	1s
End-to-end tests, chromium	13m 38s
End-to-end tests, firefox	18m 13s
End-to-end tests, webkit	12m 18s
Run the Django test suite	8m 21s
docker_build (production) / Build image	2m 46s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 48s
Simulate upgrading instances (2.7.4)	1m 29s
Scan docker image	2m 18s
Simulate upgrading instances (2.7.8)	1m 30s
Check for unexepected OAS changes	0s
Generate Postman collection from OAS	0s
Generate SDKs from OAS	0s
Validate OAS	0s
Push Docker image	0s
update-docker-readme	0s
	1h 12m 52s

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