Specify S3 region explicitly
Specify S3 region explicitly

Fog changed to using AWS V4, and can't guess the correct region any
more. This leads to error messages from S3 like:

> The authorization header is malformed; the region 'us-east-1' is wrong;
> expecting 'eu-west-1'

As a fix, we will specify the region explicitly via the S3_REGION
environment variable.

See https://github.com/fog/fog/issues/3275

MjAbuz/peoplefinder,ministryofjustice/peoplefinder,ministryofjustice/peoplefinder,ministryofjustice/peoplefinder,ministryofjustice/peoplefinder,ministryofjustice/peoplefinder,MjAbuz/peoplefinder,MjAbuz/peoplefinder,MjAbuz/peoplefinder