Add a script to spawn a local testing database

scripts/run-test-db.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+# Runs a local database in the background listening on port 5432, deleting itself once stopped
+# Requires Docker. May need sudo if your user isn't in the `docker` group.  
+docker run --rm --detach --publish 5432:5432 -e POSTGRES_HOST_AUTH_METHOD=trust postgres:alpine