Allow custom images in tests #2109

Job	Run time
Run Cargo Deny (advisories)	42s
Run Rustfmt	11s
Run Cargo Deny (bans licenses sources)	44s
Run Cargo Udeps	1m 26s
Select target helm repository based on action trigger	1s
Check if committed Helm charts are up to date	54s
Check if committed README is the one we would render from the available parts	21s
Run Clippy	31s
Run RustDoc	1m 7s
Run Cargo Tests	39s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	10m 42s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 6s
Build and publish manifest list	55s
Run the OpenShift Preflight check on the published images	12s
	27m 32s

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