Dotenv output is not compatible with Ruby Dotenv

[YouSysAdmin]

Hi. Ruby Dotenv >=3 deprecated this format for environment variable values

PRIVATE_KEY="-----BEGIN RSA PRIVATE KEY-----\nHkVN9...\n-----END DSA PRIVATE KEY-----\n"

and requires use of multi-line values

PRIVATE_KEY="-----BEGIN RSA PRIVATE KEY-----
...
HkVN9...
...
-----END DSA PRIVATE KEY-----"

ref: https://github.com/bkeepers/dotenv?tab=readme-ov-file#multi-line-values