Increase multipart-chunk-size-mb for aws s3 backup script

roles/backup/templates/s3backup.sh

@@ -86,6 +86,7 @@ if command -v psql > /dev/null 2>&1; then
 		sudo -u postgres pg_dump "$db" \
 			| gzip -v9 \
 			| aws s3 cp - \
+			--multipart-chunk-size-mb 50 \
 			"s3://{{ backup_s3_bucket }}/{{ inventory_hostname }}/$db-$(date "+{{ backup_dateformat }}").pgsql.gz"
 	done
 fi