[WIP] feat(marketplace): add marketplace providers

[christoph-jerolimov]

Hey, I just made a Pull Request!

This PR is WIP and adds a first version of a Marketplace CLI and additional Providers to the catalog module.

CLI

You can run the CLI from the marketplace workspace:

./packages/marketplace-cli/bin/marketplace-cli extract quay.io/janus-idp/backstage-showcase:next

Extract quay.io/janus-idp/backstage-showcase:next
Extracting from OCI image quay.io/janus-idp/backstage-showcase:next

apiVersion: marketplace.backstage.io/v1alpha1
kind: Plugin
metadata:
  name: janus-idp/backstage-showcase
  title: janus-idp/backstage-showcase
  description: Minimal image for running Node.js 20 applications
spec:
  type: frontend-plugin
  lifecycle: unknown
  owner: author
  developer: Red Hat, Inc.
  description: Node.js 20 available as container is a base platform for running
    various Node.js 20 applications and frameworks. Node.js is a platform built
    on Chrome's JavaScript runtime for easily building fast, scalable network
    applications. Node.js uses an event-driven, non-blocking I/O model that
    makes it lightweight and efficient, perfect for data-intensive real-time
    applications that run across distributed devices.

./packages/marketplace-cli/bin/marketplace-cli extract @backstage-community/plugin-tekton      

Extract @backstage-community/plugin-tekton
Extracting from NPM package @backstage-community/plugin-tekton
Found version 3.17.0

apiVersion: marketplace.backstage.io/v1alpha1
kind: Plugin
metadata:
  name: "@backstage-community/plugin-tekton"
  title: "@backstage-community/plugin-tekton"
  links:
    - url: https://red.ht/rhdh
      title: Homepage
    - url: https://github.com/backstage/community-plugins/issues
      title: Bugs
      type: bug-tracker
spec:
  type: frontend-plugin
  lifecycle: unknown
  owner: author
  developer: Red Hat
  keywords:
    - support:production
    - lifecycle:active
    - kubernetes
    - tekton
    - backstage
    - plugin
  description: ""
  installation:
    markdown: |
      # Installation

      ```
      yarn install @backstage-community/plugin-tekton
      ```

Providers

Microsite

The incl. backstage app (yarn dev) currently imports all packages from the backstage repository (currently hard coded in plugins/catalog-backend-module-marketplace/src/providers/MarketplaceMicrositeProvider.ts, I will address that next)

OCI

WIP

NPM

WIP

✔️ Checklist

• A changeset describing the change and affected packages. (more info)
• Added or Updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)

[rhdh-gh-app]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
backend	workspaces/marketplace/packages/backend	none	v0.0.0
@red-hat-developer-hub/marketplace-cli	workspaces/marketplace/packages/marketplace-cli	none	v0.0.0
@red-hat-developer-hub/backstage-plugin-catalog-backend-module-marketplace	workspaces/marketplace/plugins/catalog-backend-module-marketplace	none	v0.0.0
@red-hat-developer-hub/backstage-plugin-marketplace-backend	workspaces/marketplace/plugins/marketplace-backend	none	v0.0.0
@red-hat-developer-hub/backstage-plugin-marketplace-common	workspaces/marketplace/plugins/marketplace-common	none	v0.0.0