Currently, it is only possible to upload sourcemaps to a single project at a time. However, the Sentry HTTP API which we use to upload sourcemaps supports associating the uploaded sourcemaps with multiple projects, and so, we would like to enable this functionality in Sentry CLI.

Solution brainstorm

It is already possible to provide multiple projects to a Sentry CLI command by passing the -p or --project argument multiple times, like so:

sentry-cli sourcemaps upload -p proj1 -p proj2 ...

However, the sentry-cli sourcemaps upload command only takes the first project provided (see Config::get_org_and_project and Config::get_project methods), the rest of the projects passed are ignored.

Instead, let's use Config::get_projects (note: plural) to get all of the projects passed. Then, modify the UploadContext struct to store multiple projects, instead of just a single project, and pass all of these projects in the HTTP request we make to Sentry.