This commit adds the Job, TestCase and Result tables for the
database and include the database migrations files.

It also adds a new run-qa-report script that will be used to
properly handle the postgresql database connection during startup
to make sure it is available before executing the main qa-report app.

The commit also updates the Dockerfile to include the wait-for-it
package.

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>