How can I pass environment variables to a Docker container with Terraform?

Question

I'm spawning Docker containers using Terraform's Docker provider, but fail to understand how to pass them environment variables.

The project's documentation on the env option states :

env - (Optional, set of strings) Environment variables to set.

What is a "set of strings" in context ? Can you provide an example docker container resource declaration that uses the env option ?

Answer 1

From Terraforming a Docker environment:

# Start elastic container
resource "docker_container" "elastic" {
    image = "${docker_image.elastic.latest}"
    name = "elastic"
    hostname = "elastic"
    env = ["SERVICE=elastic", "PROJECT=stage", "ENVIRONMENT=operations"]
    restart= "no"
    must_run="true"
}