Revert "feat: pass private key as env variable SSH_KEY"

This reverts commit 73f25ab8d2.

ssh_router.sh

@@ -125,10 +125,11 @@ start_container_if_needed() {
       --user "$DEV_USER" \
       --hostname "$WORKSPACE" \
       --label auto-cleanup=true \
-      -e SSH_KEY="$(cat $HOME/secrets/$WORKSPACE/id_ed25519)" \
       -v "/mnt/private/workspaces-data/public/$WORKSPACE:/app/public" \
       -v "/mnt/private/workspaces-data/private/$WORKSPACE:/app/private" \
       -v "$HOME/secrets/$WORKSPACE/gitconfig:/home/$DEV_USER/.gitconfig:ro,Z" \
+      -v "$HOME/secrets/$WORKSPACE/id_ed25519:/home/$DEV_USER/.ssh/id_ed25519:ro,Z" \
+      -v "$HOME/secrets/$WORKSPACE/id_ed25519.pub:/home/$DEV_USER/.ssh/id_ed25519.pub:ro,Z" \
       --entrypoint "/home/$DEV_USER/start.sh" \
       "$IMAGE" "$TMUX_SESSION"
   elif ! podman inspect -f '{{.State.Running}}' "$WORKSPACE" | grep -q true; then