Kamal pre-deploy hook to run database migrations. File path .kamal/hooks/pre-deploy

pre-deploy

#!/usr/bin/env ruby

# These environment variables are available:
# KAMAL_RECORDED_AT
# KAMAL_PERFORMER
# KAMAL_VERSION
# KAMAL_HOSTS
# KAMAL_COMMAND
# KAMAL_SUBCOMMAND
# KAMAL_ROLE (if set)
# KAMAL_DESTINATION (if set)

# Only check the build status for production deployments
if ENV["KAMAL_COMMAND"] == "rollback" || ENV["KAMAL_DESTINATION"] != "production"
  exit 0
end

`kamal app exec -p -d $KAMAL_DESTINATION --version $KAMAL_VERSION "rails db:migrate"`