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Issue description

The section describes the podman secrets feature and how it is used.
Since also podman's documentation is vague about the usage of secrets, I think it would have value to specify here the possible options of running a container with secrets.

The section describes how to mount a secret as a file under /run/secrets inside the container, but secrets are more useful/used as environment variables.

Steps to reproduce:

podman run --name test-container --secret=mysecret,type=env,target=MY_SECRET localhost/testimage

Workaround:

.

Expected result:

I would expect to see the procedure of running a container with a secret as an environment variable.