[sshd] Add GatewayPorts option #1464
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We want to optionlly enable the GatewayPorts option in sshd.
To test:
devcontainer features test --features sshd
Background:
Our development setup runs in Codespaces with Docker Compose. To handle TLS termination and spoof internal IPs, we use a reverse tunnel via
gh cs ssh -- -R
and proxys on workstations.Without GatewayPorts, only the main container can access the tunnel—other containers can’t. Enabling GatewayPorts allows the tunnel to bind to the container’s public interfaces too, so other containers can use it. This is required for our transparent proxy setup.