Merge branch 's3-addressing-style' into 'master'

Use newer S3 hostname style

Closes #772

See merge request !1381

arkindex/project/aws.py

@@ -21,6 +21,9 @@ session = boto3.session.Session(
 config = Config(
     region_name=settings.AWS_REGION,
     signature_version='s3v4',
+    s3={
+        'addressing_style': 'auto' if settings.AWS_ENDPOINT else 'virtual',
+    }
 )
 
 s3 = session.resource(