newrelic: fix newrelic starting without license key.

Fix an issue where the New Relic agent always started in the production
environment, even when a license key wasn't configured.

Also make the New Relic agent log to stdout instead of log/newrelic_agent.log.

script/install/newrelic.yml

@@ -1,46 +0,0 @@
-# This file configures the New Relic Agent.  New Relic monitors Ruby, Java,
-# .NET, PHP, Python, Node, and Go applications with deep visibility and low
-# overhead.  For more information, visit www.newrelic.com.
-#
-# For full documentation of agent configuration options, please refer to
-# https://docs.newrelic.com/docs/agents/ruby-agent/installation-configuration/ruby-agent-configuration
-
-common: &default_settings
-  # Required license key associated with your New Relic account.
-  license_key: YOUR_LICENCE_KEY_HERE
-
-  # Your application name. Renaming here affects where data displays in New
-  # Relic.  For more details, see https://docs.newrelic.com/docs/apm/new-relic-apm/maintenance/renaming-applications
-  app_name: Danbooru
-
-  # To disable the agent regardless of other settings, uncomment the following:
-  # agent_enabled: false
-
-  # Logging level for log/newrelic_agent.log
-  log_level: info
-
-  # https://docs.newrelic.com/docs/agents/ruby-agent/background-jobs/rake-instrumentation
-  rake:
-    tasks: ["maintenance:.*"]
-
-# Environment-specific settings are in this section.
-# RAILS_ENV or RACK_ENV (as appropriate) is used to determine the environment.
-# If your application has other named environments, configure them here.
-development:
-  <<: *default_settings
-  app_name: Danbooru (Development)
-
-  # New Relic is disabled by default in the development environment. Uncomment to enable.
-  # monitor_mode: true
-
-test:
-  <<: *default_settings
-  # It doesn't make sense to report to New Relic from automated test runs.
-  monitor_mode: false
-
-staging:
-  <<: *default_settings
-  app_name: Danbooru (Staging)
-
-production:
-  <<: *default_settings