Issue when rsync debian-ports only riscv64 with ftpsync

hi,
I am syncing the Debian-ports mirror with archvsync[0] and followed its
instructions in README.

And the etc/ftpsync-ports.conf is:

```
MIRRORNAME=`hostname -f`
TO="/home/debian_sync/mirrors/debian/"
# MAILTO="$LOGNAME"
# HUB=false

########################################################################
## Connection options
########################################################################

RSYNC_HOST=ftp.de.debian.org
RSYNC_PATH=debian-ports
# RSYNC_USER=
# RSYNC_PASSWORD=

########################################################################
## Mirror information options
########################################################################

...

########################################################################
## Include and exclude options
########################################################################

ARCH_INCLUDE="pool-riscv64 source"
#ARCH_EXCLUDE="pool-alpha pool-hppa pool-hurd-i386 pool-ia64 pool-m68k
pool-powerpc pool-ppc64 pool-sh4 pool-sparc64 pool-x32 pool-kfreebsd-amd64
pool-kfreebsd-i386"

...

# LOGDIR=
```
As the title described, I want to sync riscv64 mirror only in order to
deduce the resources. But I enable the `$ARCH_INCLUDE` or "$ARCH_EXCLUDE".
It seems does not work, the log file hint it will sync other arch debs,
such pool-alpha and so on. So, there are some wrong with me?

The ftpsync cmd is `debian_sync@dev:~$ ./bin/ftpsync sync:archive:ports`.

I think the Debian official release arch is ok. Eg,
`$ARCH_INCLUDE="amd64 source"`. The config will enable ftpsync rsync amd64
arch deb packages only.

Thanks,
Bo
[0]: https://salsa.debian.org/mirror-team/archvsync