The recommended way to create a local configuration file for the Certificate Activator service is through CDF's installer.
Once you had deployed cdf to your AWS account, you can generate .env file to be used for your local development
The instruction to generate the local file can be found here. The .env file will be populated with resources and options that are specified during the deployment wizard flow.
#Application logging level. Set to (in order) error, warn, info, verbose, debug or silly.
LOGGING_LEVEL=info