fixup! Use postgres service settings to create nztraintest db

Comment out the setting for now, so that we're actually testing the
script that creates the database. Keeping it as a comment because it
might be useful when we pare down the install scripts.

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
         image: postgres:11-alpine
         ports: ["5432:5432"]
         env:
-          POSTGRES_DB: nztraintest
+          #POSTGRES_DB: nztraintest # not required because script/install.bash creates the database
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres
         options: >-