At the moment, we are using the dotenv-cli package to load our environment variables when running our application, which supports multi-line variables as long as you enclose the variable in double quotes (") and replacing the newline characters with \n. Therefore, we can define our keys by adding the following entries (truncated for brevity) into our .env, .env.example, test.env, and test.env.example files:

PRIVATE_KEY="-----BEGIN RSA PRIVATE KEY-----\nMIIJKAIBAAKCAgEAsTwK1Tireh3TVaJ66yUEAtLPP5tNuqwZW/kA64t7hgIRVKee\n1WjbKLcHIJcAcioHJnqME96M+YRaj/xvlIFSwIbY1CRPgRkqH7kHs6mnrOIvmiRT\nPxSOtzy........tsgHX4Tl6O4=\n-----END RSA PRIVATE KEY-----"
PUBLIC_KEY="-----BEGIN RSA PUBLIC KEY-----\nMIICCgKCAgEAsTwK1Tireh3TVaJ66yUEAtLPP5tNuqwZW/kA64t7hgIRVKee1Wjb\nKLcHIJcAcioHJnqME96M+YRaj/xvlIFSwIbY1CRPgRkqH7kHs6mnrOIvmiRTPxSO\ntzydJxN........+wskCAwEAAQ==\n-----END RSA PUBLIC KEY-----"