Add docker_env option to terminal config — a dict of key-value pairs that
get set inside Docker containers via -e flags at both container creation
(docker run) and per-command execution (docker exec) time.
This complements docker_forward_env (which reads values dynamically from
the host process environment). docker_env is useful when Hermes runs as a
systemd service without access to the user's shell environment — e.g.
setting SSH_AUTH_SOCK or GNUPGHOME to known stable paths for SSH/GPG
agent socket forwarding.
Precedence: docker_env provides baseline values; docker_forward_env
overrides for the same key.
Config example:
terminal:
docker_env:
SSH_AUTH_SOCK: /run/user/1000/ssh-agent.sock
GNUPGHOME: /root/.gnupg
docker_volumes:
- /run/user/1000/ssh-agent.sock:/run/user/1000/ssh-agent.sock
- /run/user/1000/gnupg/S.gpg-agent:/root/.gnupg/S.gpg-agent
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