Remove the `sleep 8` from the code that performs DB migration when deploying,
and add a loop that waits for the `cloud_sql_proxy` socket to become
available.

Change log entries to be more generic in terms of DB management tool, and to
give more info about the state of DB migration.

Replace fixed delay when performing Django DB migration

Closes #34

See merge request !34

add a terraform deployment template

Closes #26

See merge request !31