Can you use a .env file for a stand-alone Dockerfile?

Question

I am working on a simple Docker image that has a large number of environment variables. Are you able to import an environment variable file like with docker-compose? I canno

Answer 1

If you need environment variables runtime, it's easiest to create a launcher script that sets up the environment with multiple export statements and then launches your process.

If you need them build time, have a look at the ARG and ENV statements. You'll need one per variable.