Provide a standard URL to retrieve metadata on gitpod self hosted release artifacts (images)

[mrzarquon]

Is your feature request related to a problem? Please describe

In order to automate the importing of Gitpod releases, users need a known way to get that information. Currently that information only resides in the gitpod-installer binary. Retrieving that information involves download it and then parsing the output.

Describe the behaviour you'd like

Users should be able to curl a known url to get the latest build manifests of a gitpod release in both human and machine readable format.

Something like curl https://releases.gitpod.io/latest/info would return the latest version information, similar urls would return the list of available versions, and allow for retrieving specific version information.

The data returned would be the something like date/time of release, the images in the release, each images tag, sha, and integrity checksum related to the release.

This would compliment #12812 and enable a stable integration end point for customers to implement automated replication of gitpod for airgapped environments.

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.