neonvm: add readiness probe for runner container #4437

Job	Run time
get-tag	1s
build-test-vm / build (amd64)	6m 9s
build-test-vm / build (arm64)	9m 48s
build-images / vm-kernel / setup-build-vm-kernel-image (amd64)	7s
build-images / vm-kernel / setup-build-vm-kernel-image (arm64)	4s
build-images / vm-kernel / get-tags	3s
build-images / vm-kernel / build-vm-kernel-image (amd64)	20s
build-images / vm-kernel / build-vm-kernel-image (arm64)	22s
build-images / vm-kernel / merge-kernel-images	11s
build-images / build (amd64)	4m 0s
build-images / build (arm64)	5m 50s
build-test-vm / merge-vm-images	17s
build-images / merge-images	42s
e2e-tests (k3d, amd64)	11m 19s
Conclusion	1s
	39m 14s

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