build: support external networks and labeled external network (#47)

Author: iBotPeaches

docker/data-source-services/docker-compose.yml

@@ -2,7 +2,7 @@
 # Everything ahead of the last two digits are standard for the given service
 #
 # Network name is st-{service name}-{service MAJOR.MINOR}
-version: '2'
+version: '3.8'
 services:
   nginxproxy:
 # Enable nginx debug and increase output verbosity

docker/data-source-services/network-creation.sh

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 echo "Creating container networks:"
-docker network create st-internal
+docker network create st-internal --label "com.docker.compose.network=default"

docker/data-source-tools/docker-compose.yml

@@ -1,4 +1,4 @@
-version: '2'
+version: '3.8'
 services:
   phpmyadmin:
     image: phpmyadmin/phpmyadmin:latest