This change allows for a HelmRepository to point to e.g. "ghcr.io" and
then a HelmRelease pointing to the chart "stefanprodan/charts/podinfo"
in its `.spec.chart.spec.chart` field.
Related discussion: https://github.com/fluxcd/flux2/discussions/2959
Signed-off-by: Max Jonas Werner <max@e13.dev>