[Type] and [Options] are optional for disk devices. To reduce unnecessary writings to SSD devices the noatime option is recommended.
Name the file according to $YOUR_MOUNT_PATH.mount
[Unit]
Description=Mount build partition
[Mount]
What=/dev/disk/by-uuid/$UUID
Where=$YOUR_MOUNT_PATH
Type=ext4
Options=rw,noatime
[Install]
WantedBy=multi-user.target