feat: better registry handling ✨ #2212

Job	Run time
build_cargo	55s
build_operator	1m 30s
build_test_image	31s
Test Gefyra Operator	12m 1s
test_python	28s
test_minikube (ubuntu-latest, linux)	1m 29s
test_minikube (macos-13, virtualbox, darwin)	22m 54s
test (v1.25.16-k3s4)	1m 17s
test (v1.26.15-k3s1)	1m 19s
test (v1.27.14-k3s1)	1m 14s
test (v1.28.10-k3s1)	1m 19s
test (v1.29.5-k3s1)	1m 15s
test (v1.30.1-k3s1)	1m 21s
Indicate completion to coveralls.io	0s
	47m 33s

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