fix(bot): add explicit process command to fly.toml (#2017)

The Fly app was running the Probot CLI instead of the programmatic
server.ts because the Dockerfile CMD was being overridden. Adding
an explicit [processes] section ensures Fly uses the correct
entrypoint (node ./lib/server.js) which reads GITHUB_BOT_* env vars.

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: yujonglee

apps/bot/fly.toml

@@ -9,6 +9,9 @@ primary_region = 'sjc'
 [build]
 dockerfile = "Dockerfile"
 
+[processes]
+app = "node ./lib/server.js"
+
 [deploy]
 strategy = 'bluegreen'