feat: better registry handling ✨ #2163

Job	Run time
build_cargo	48s
build_operator	1m 33s
build_test_image	28s
Test Gefyra Operator	12m 12s
test_python	4m 28s
test_minikube (ubuntu-latest, linux)	1m 37s
test (v1.25.16-k3s4)	1m 26s
test_minikube (macos-13, virtualbox, darwin)	31m 34s
test (v1.26.15-k3s1)	1m 19s
test (v1.27.14-k3s1)	1m 24s
test (v1.28.10-k3s1)	1m 25s
test (v1.29.5-k3s1)	1m 16s
test (v1.30.1-k3s1)	1m 28s
Indicate completion to coveralls.io	0s
	1h 0m 58s

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