Core v3 fails to start without an .env file

[adrian69]

It seems v3 doesn't honor exported env vars and fails to start without an .env file.

Expected Behavior
It should use exported env vars (process.env):

bash-5.0$ env | grep CORE
CORE_API_PORT=4003
CORE_DB_DATABASE=core_devnet
CORE_DB_USERNAME=node
CORE_P2P_HOST=0.0.0.0
CORE_EXCHANGE_JSON_RPC_HOST=0.0.0.0
CORE_DB_PASSWORD=password
CORE_LOG_LEVEL=debug
CORE_WEBHOOKS_PORT=4004
CORE_LOG_LEVEL_FILE=info
CORE_P2P_PORT=4002
CORE_DB_HOST=postgres-devnet
CORE_ELASTICSEARCH_HOST=elastic-devnet
CORE_API_HOST=0.0.0.0
CORE_ELASTICSEARCH_PORT=9200
CORE_WEBHOOKS_HOST=0.0.0.0
CORE_EXCHANGE_JSON_RPC_PORT=8080

Current Behavior

It simply fails to start if there is no .env file with the following error:

Error: [ERROR] Unable to load the environment file. ENOENT: no such file or directory, open '/home/node/.config/ark-core/devnet/.env'
    at Fatal.render (/home/node/.config/yarn/global/node_modules/@arkecosystem/core-cli/dist/components/fatal.js:22:15)
    at ComponentFactory.fatal (/home/node/.config/yarn/global/node_modules/@arkecosystem/core-cli/dist/component-factory.js:118:54)
    at Command.run (/home/node/.config/yarn/global/node_modules/@arkecosystem/core-cli/dist/commands/command.js:124:29)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
 ✖  unhandledRejection (a promise was rejected but not handled)  Error: [ERROR] Unable to load the environment file. ENOENT: no such file or directory, open '/home/node/.config/ark-core/devnet/.env'
    at Fatal.render (/home/node/.config/yarn/global/node_modules/@arkecosystem/core-cli/dist/components/fatal.js:22:15)
    at ComponentFactory.fatal (/home/node/.config/yarn/global/node_modules/@arkecosystem/core-cli/dist/component-factory.js:118:54)
    at Command.run (/home/node/.config/yarn/global/node_modules/@arkecosystem/core-cli/dist/commands/command.js:124:29)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

[sebastijankuzner]

Expected behavior is that node should not boot without .env file.