Add latest recipe revision endpoint

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What does this MR do and why?

This MR add the V2 endpoint to get latest recipe revision. This endpoint is also used by v1 with revision. This endpoint is required to install packages.

Request: GET /api/v4/projects/:id/packages/conan/v2/conans/:package_name/:package_version/:package_username/:package_channel/latest

Response: { "revision" : "75151329520e7685dcf5da49ded2fec0", "time" : "2024-12-17T09:16:40.334+0000" }

References

• #519741 (closed): Conan V2 follow up issue

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

No UI changes

How to set up and validate locally

1. Switch the conan_package_revisions_support feature flag on.

   For GDK, open rails console (docs):

   gdk rails console

   Enable the feature flag:

   # Enable
   Feature.enable(:conan_package_revisions_support)
   
   # Verify
   Feature.enabled?(:conan_package_revisions_support)

2. Get Conan Authentication Token

   First, generate a base64-encoded Basic Auth token:

   # Replace with your username and PAT
   echo -n "USERNAME:glpat-YOUR-TOKEN"|base64

   Then use the output to get a Conan JWT token:

   curl --request GET \
   --url 'http://localhost:3000/api/v4/projects/<project_id>/packages/conan/v1/users/authenticate' \
   --header 'Authorization: Basic <YOUR-BASE64-TOKEN>'

3. Make sure to upload the same file in the same package with two different revisions

   You will have to check out the 333033-put-endpoint-revision-recipe-file branch to be able to upload recipe files as a prerequisite for manual testing. Follow the instructions here to manually upload the same recipe file with different revisions (conanfile.py). Upload once the file with revision 123456789012345678901234567890ab and after with 11111111111111111111111111111111.

4. Call the get recipe files endpoint

   Make sure you are back on this branch 519741-latest-recipe-files and run:

   curl --request GET \
   'http://localhost:3000/api/v4/projects/<project_id>/packages/conan/v2/conans/upload-v2-package/1.0.0/user/stable/latest' \
   --header 'Authorization: Bearer <YOUR-CONAN-JWT-TOKEN>'

   that should return status 200 OK and body with latest revision:

   {
     "revision" : "11111111111111111111111111111111",
     "time" : "<Time of upload in iso-8601 format: 2025-03-04T12:46:18.844Z"
   }

/cc @mbo5be

Related to #519741 (closed)