Add shareableUrl

Author: MrVauxs

src/nextcloud/NextcloudArtifact.ts

@@ -96,6 +96,7 @@ export class NextcloudArtifact {
         },
         ...github.context.repo
       })
+      core.setOutput('shareableUrl', shareableUrl)
       core.info(`Check run create response: ${resp.status}`)
       core.info(`Check run URL: ${resp.data.url}`)
       core.info(`Check run HTML: ${resp.data.html_url}`)