First pass at gitlab ci compile support

Use services and scripts and psql to setup
the schema for the fsharp code to compile!

.gitlab-ci.yml

+build:
+  image: mcr.microsoft.com/dotnet/core/sdk:3.1-alpine
+  services:
+    - postgres:12.1-alpine
+  variables:
+    POSTGRES_DB: postgres
+    POSTGRES_USER: test_app
+    POSTGRES_PASSWORD: pass
+  script:
+    - apk add postgresql-client
+    - ./ci-pg-setup.sh
+    - CI=TRUE dotnet build

ci-pg-setup.sh

+#!/bin/sh
+
+echo "CREATE SCHEMA IF NOT EXISTS test AUTHORIZATION test_app;" \
+  | PGPASSWORD=pass psql -h postgres -U test_app -d postgres -f -
+
+cat schema.sql | PGPASSWORD=pass psql -h postgres -U test_app -d postgres -f -