compose: split production settings from app settings

Things like traefik, and the webnetwork are production settings. Put
those settings in a separate file that can be symlinked to
`docker-compose.override.yml` on the production host.
7 jobs for secdb-to-go in 54 seconds (queued for 1 second)
Status Name Job ID Coverage
  Verify
passed lint #381168
docker-alpine x86_64

00:00:11

 
  Build
passed build-aarch64 #381173
docker-alpine ci-docker-image aarch64

00:00:19

passed build-armv7 #381174
docker-alpine ci-docker-image armv7

00:00:28

passed build-ppc64le #381172
docker-alpine ci-docker-image ppc64le

00:00:26

passed build-s390x #381169
docker-alpine ci-docker-image s390x

00:00:26

passed build-x86 #381171
docker-alpine ci-docker-image x86

00:00:11

passed build-x86_64 #381170
docker-alpine ci-docker-image x86_64

00:00:12