kratos: Dotenv files are respected and incorrectly override environment variables

Describe the bug

If I have ENVironment variables and a .env file in root where kratos starts it reads the .env file variable instead of the environment variable.

Reproducing the bug

Steps to reproduce the behavior:

1. Run export DSN="varFromEnv"
2. Create .env file with: DSN="varFromFile"
3. Run ./kratos -c ./kratos.yml migrate sql -e --yes

The value of DSN in Kratos is: varFromFile.

Expected behavior

I think we should read FIRST from Environment variable (if present) because .env file can contain development vars (as in my case).

Environment

• Version: oryd/kratos:v0.7.6-alpha.1
• Environment: Docker