Migrate from Tekton Hub to Artifact Hub

[QuanZhang-William]

Feature request

This issue tracks the action items and progress of the migration work from Tekton Hub to Artifact Hub.

Background

Based on @jerop's investigation on Artifact Hub (Thanks @jerop 🎆! ) and discussion in the Tekton Hub community, we have decided to migrate to Artifact Hub as the entry point to Tekton Catalogs. 😁

Use case

To summarize the advantages of Artifact Hub:

• The Artifact Hub is owned by the Cloud-Native Computing Foundation (CNCF), supporting more than 10 types of resources other than Tekton. Tekton can benefit from the better visibility in Artifact Hub.
• The Artifact Hub has a natural support for the distributed catalog repository model proposed in TEP-0115, including repo registration and ownership claim features that are not supported in the Tekton Hub.
• The Artifact Hub supports 2 support tiers for the packages: Verified Publisher and Official Status and displays corresponding badges in the UI. This feature is required in TEP-0079 but not yet supported in the Tekton Hub.
• The Artifact Hub supports image scanning for Common Vulnerabilities and Exposures (CVEs). This feature is required in TEP-0079 but not supported in the Tekton Hub yet.
• Other advantages include email notification, metrics, scalability, authentication, licensing... Details can be found in the Tekton Hub vs Artifact Hub (Thanks again @jerop 🙇 !)

Migration Status

Based on the discussion in the Tekton Hub community, we've agreed on the following plan:

• The Tekton community will continue maintaining the current instance of Tekton Hub(i.e. https://hub.tekton.dev/) until all the dependencies are migrated to Artifact Hub. We will deprecate https://hub.tekton.dev/ after the migration (timeline TBD).
• The Tekton community will be mainly focusing on contributing to Artifact Hub. All the new features will ONLY be supported in Artifact Hub (e.g. features requested in TEP-0079)
• As per discussion with @vdemeester and @PuneetPunamiya in the WG, the Tekton Hub repository will be mainly maintained by the RedHat team (but of course, community help is still welcomed 😄 ).

Migration Breakdown

• Support git-based versioning for Tekton packages in Artifact Hub
  • tracking issue: Add Git-Based Versioning for Tekton Packages artifacthub/hub#2326 (Thanks @tegioz for the support from the Artifact Hub community! 🙇 )
• Add support in Hub Resolver to resolve resources from Artifact Hub.
  • TODO: details to be added in in TEP-0115
• Support tkn hub CLI to resolve resources from Artifact Hub.
  • TODO: to be tracked in another FR
• Send out emails/notifications in the Tekton community to identify and migrate other usages of Tekton Hub APIs.

[QuanZhang-William]

/assign @QuanZhang-William

[QuanZhang-William]

moving this issue to Hub repo: tektoncd/hub#667 😅