Set default production log level to info (#1010)

## Summary
- default production log level to info
- document that debug logs are for troubleshooting
- warn in production when debug logs are enabled

## Testing
- `bin/ci` *(fails: bundler: command not found: rails)*
- `bundle exec rubocop` *(fails: bundler: command not found: rubocop)*
- `bundle exec brakeman -q -w2` *(fails: bundler: command not found:
brakeman)*
- `bundle exec bundler-audit --update` *(fails: bundler: command not
found: bundler-audit)*
- `bin/codex_style_guard` *(fails: bundler: command not found: rubocop)*

------
https://chatgpt.com/codex/tasks/task_e_689b685334848321a71aedc20ae48931

Author: rsmithlal

.env.prod.sample

@@ -24,7 +24,7 @@ PORT=5000
 
 RACK_ENV=production
 RAILS_ENV=production
-RAILS_LOG_LEVEL=debug
+RAILS_LOG_LEVEL=info
 RAILS_LOG_TO_STDOUT=true
 RAILS_SERVE_STATIC_FILES=true
 

docs/production/deployment-dokku.md

@@ -59,4 +59,8 @@ dokku docker-options:add communityengine.app build '--build-arg FOG_HOST'
 dokku docker-options:add communityengine.app build '--build-arg FOG_REGION'
 dokku docker-options:add communityengine.app build '--build-arg ASSET_HOST'
 dokku docker-options:add communityengine.app build '--build-arg CDN_DISTRIBUTION_ID'
-```
+```
+
+## Logging
+
+Configure the application log level with the `RAILS_LOG_LEVEL` environment variable. Use `info` or `warn` in production and reserve `debug` for troubleshooting.

spec/dummy/config/environments/production.rb

@@ -96,6 +96,12 @@
 
   config.log_level = ENV.fetch('RAILS_LOG_LEVEL', 'info').to_sym
 
+  if config.log_level == :debug
+    config.after_initialize do
+      Rails.logger.warn('RAILS_LOG_LEVEL is set to debug; use only for troubleshooting.')
+    end
+  end
+
   # Do not dump schema after migrations.
   config.active_record.dump_schema_after_migration = false