Add PR author as app collaborator (#21353)

script/deployment/create-app.js

@@ -10,6 +10,7 @@ export default async function createApp(pullRequest) {
       repo: { name: repo },
     },
     head: { ref: branch },
+    user: author,
   } = pullRequest
 
   const appName = createAppName({ prefix: 'ghd', repo, pullNumber, branch })
@@ -36,6 +37,23 @@ export default async function createApp(pullRequest) {
     } catch (error) {
       throw new Error(`Failed to create Heroku App ${appName}. Error: ${error}`)
     }
+
+    // Add PR author (if staff) as a collaborator on the new staging app
+    try {
+      if (author.site_admin === true) {
+        await heroku.post(`/apps/${appName}/collaborators`, {
+          body: {
+            user: `${author.login}@github.com`,
+            // We don't want an email invitation for every new staging app
+            silent: true,
+          },
+        })
+        console.log(`Added PR author @${author.login} as a Heroku app collaborator`)
+      }
+    } catch (error) {
+      // It's fine if this fails, it shouldn't block the app from deploying!
+      console.warn(`Warning: failed to add PR author as a Heroku app collaborator. Error: ${error}`)
+    }
   } else {
     console.log(`Heroku App ${appName} already exists.`)
   }