Extract EXIF data from images

This required a schema change and actually dumps all existing photo data
from the public reports page. That's probably fine since it's not
deployed to any customers so all data is currently test data.

background/arcgis.go

@@ -338,6 +338,10 @@ func updatePortalData(ctx context.Context, client *arcgis.ArcGIS, user_id int32)
 	}
 
 	tx, err := db.PGInstance.BobDB.BeginTx(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to create transaction: %w", err)
+	}
+
 	_, err = models.ArcgisUserPrivileges.Delete(
 		dm.Where(
 			models.ArcgisUserPrivileges.Columns.UserID.EQ(psql.Arg(p.User.ID)),