This seems appropriate now that we've stabilized the new configuration.
Of note are the configuration updates and the use of an environment
variable to specify the connection URI. This upgrade also fixes the
health checks.

Regenerating the configuration lost the table descriptions, which seems
to be because they were not present in the Chinook SQL. I have dragged
the Chinook SQL in from ndc-postgres and kept it separate from the
initialization of other tables.

The auto-generated configuration is slightly different from the
manually-created configuration in that the collection names are
singular, not plural. This means that I had to change a lot of test
metadata files too.

V3_GIT_ORIGIN_REV_ID: 2b66fd3049aaf4daeb386915ea3b64a209b1f393