Allow using custom images in tests #2005

Job	Run time
Run Clippy	29s
Run Cargo Deny (advisories)	37s
Check if committed README is the one we would render from the available parts	18s
Check if committed Helm charts are up to date	40s
Run Cargo Deny (bans licenses sources)	36s
Run RustDoc	1m 5s
Run Rustfmt	14s
Run Cargo Tests	43s
Run Cargo Udeps	1m 24s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	9m 59s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 25s
Build and publish manifest list	41s
Run the OpenShift Preflight check on the published images	13s
	26m 26s

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