sdiff, fly.io secrets differ

Usage:

# Basic
node sdiff.mjs
# Custom .env file
node sdiff.mjs --env-file .env.prod
# Filtering
node sdiff.mjs --filter='^LOCAL_|^PROXIED_' --filter=NODE_ENV --filter=PORT
# Reveal the secrets in stdout so you can copy the set or unset command
node sdiff.mjs --reveal

It gives you a nice diff view and commands to set or unset your secrets: