registry-facade should use reg.<prefix>.<domain>, not reg.<domain>

[meysholdt]

registry-facade should use reg.<prefix>.<domain>, not reg.<domain>, because registry-facade runs inside a pluggable workspaces cluster which lives under <prefix>.<domain>. Making use of reg.<domain> interferes with the domain if the meta clusters.

[meysholdt]

this just caused certificate renewal to fail once in the US clusters.
Commenting to bring this back up.

[meysholdt]

got bitten by this again.

[csweichel]

I reckon the actual issue that we're relying on the public HTTPS certificates for registry-facade.
We've recently started to move to self-signed certs in this case.

@aledbf how much trouble would it be to port your changes over to main?

(removing from groundwork until this becomes actionable)

[aledbf]

@csweichel I need to sync in #4592 the latest changes from https://github.com/aledbf/gitpod-chart-cleanup

[stale]

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