chore: update env.example with new farcaster configs

Author: sayangel

.env.example

@@ -134,6 +134,8 @@ INTIFACE_WEBSOCKET_URL=ws://localhost:12345
 FARCASTER_FID=                  # the FID associated with the account your are sending casts from
 FARCASTER_NEYNAR_API_KEY=       # Neynar API key: https://neynar.com/
 FARCASTER_NEYNAR_SIGNER_UUID=   # signer for the account you are sending casts from. create a signer here: https://dev.neynar.com/app
+FARCASTER_DRY_RUN=false         # Set to true if you want to run the bot without actually publishing casts
+FARCASTER_POLL_INTERVAL=120     # How often (in seconds) the bot should check for farcaster interactions (replies and mentions)
 
 # Coinbase
 COINBASE_COMMERCE_KEY= # from coinbase developer portal