Deleted env vars about subspace

[mzupan]

I'm seeing the same thing at #79 also it seems SUBSPACE_LISTENPORT gets lost also

[mzupan]

the fix i did was to edit the entrypoint.sh and export the var

# subspace service
if ! test -d /etc/service/subspace; then
  mkdir /etc/service/subspace
  cat <<RUNIT >/etc/service/subspace/run
#!/bin/sh
export SUBSPACE_ALLOWED_IPS="${SUBSPACE_ALLOWED_IPS}"
exec /usr/bin/subspace \
    "--http-host=${SUBSPACE_HTTP_HOST}" \
    "--http-addr=${SUBSPACE_HTTP_ADDR}" \
    "--http-insecure=${SUBSPACE_HTTP_INSECURE}" \
    "--backlink=${SUBSPACE_BACKLINK}" \
    "--letsencrypt=${SUBSPACE_LETSENCRYPT}"
RUNIT