Adds deploy attribution. (#18)

Author: mbleigh

bin/action.min.js

@@ -72,6 +72,7 @@ async function execWithCredentials(
         },
         env: {
           ...process.env,
+          FIREBASE_DEPLOY_AGENT: 'action-hosting-deploy',
           GOOGLE_APPLICATION_CREDENTIALS: gacFilename, // the CLI will automatically authenticate with this env variable set
         },
       }