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What this PR does / why we need it:
This PR introduces a reverse proxy to handle GHCR registry resolutions, primarily aimed at fetching OCI image layers directly from the IPXE environment.
For the start, this feature is exclusively designed to support only public OCI images hosted on GHCR.
Motivation:
Due to limitations in setting headers within the IPXE environment, accessing GHCR requires short-lived bearer tokens, which this proxy manages.
Example:
curl "http://localhost:8083/image?imageName=ghcr.io/ironcore-dev/ironcore-image/gardenlinux&version=rootfs-dev-20240129&layerName=initramfs" --output initramfs