ci: remove Pi heap caps on desktop agent

Desktop runner has ample RAM; let Node use default heap sizing.

Co-authored-by: Cursor <cursoragent@cursor.com>

.drone.yml

@@ -30,7 +30,6 @@ steps:
     image: oven/bun:1-alpine
     pull: false
     environment:
-      NODE_OPTIONS: "--max-old-space-size=3072"
       BUN_INSTALL_CACHE_DIR: /drone-cache/bun
       STRAVA_CLIENT_ID:
         from_secret: strava_client_id