Disable pg_dump in docker mode

Author: benjie

@app/db/scripts/dump-db

@@ -3,7 +3,9 @@ if [ "$GM_DBURL" = "" ]; then
   echo "This script should only be ran from inside graphile-migrate";
   exit 1;
 fi
-pg_dump \
+
+# When ran inside docker-compose we need to be able to run a different pg_dump binary
+${PG_DUMP:-pg_dump} \
   --no-sync \
   --schema-only \
   --no-owner \

docker-compose.builder.yml

@@ -3,6 +3,9 @@ services:
   base:
     image: node:10
     user: $UID
+    environment:
+      # pg_dump doesn't work in docker-compose mode currently
+      - PG_DUMP=echo pg_dump
     volumes:
       - .:/app
       - .docker/node_modules:/app/node_modules