Error publishing an apk

From @CiaranG:

INFO: Processing unsigned/org.briarproject.briar.android_10001.apk
WARNING: Ignoring META-INF/MANIFEST.MF from
unsigned/org.briarproject.briar.android_10001.apk
WARNING: Using Java's jarsigner, not recommended for verifying APKs! Use
apksigner
DEBUG: JAR signature verified:
tmp/sigcp_org.briarproject.briar.android_10001.apk
INFO: ...successfully verified
DEBUG: ...published org.briarproject.briar.android_10001_src.tar.gz
INFO: Published org.briarproject.briar.android_10001.apk
Traceback (most recent call last):
  File "/home/fpublish/publisher/fdroidserver/fdroidserver/common.py",
line 567, in publishednameinfo
    result = (m.group(1), m.group(2))
AttributeError: 'NoneType' object has no attribute 'group'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/fpublish/publisher/fdroidserver/fdroid", line 164, in <module>
    main()
  File "/home/fpublish/publisher/fdroidserver/fdroid", line 138, in main
    mod.main()
  File "/home/fpublish/publisher/fdroidserver/fdroidserver/publish.py",
line 213, in main
    appid, vercode = common.publishednameinfo(apkfile)
  File "/home/fpublish/publisher/fdroidserver/fdroidserver/common.py",
line 569, in publishednameinfo
    raise FDroidException(_("Invalid name for published file: %s") %
filename)
fdroidserver.exception.FDroidException: Invalid name for published file:
org.briarproject.briar.android_10001.binary.apk

cc/ @eighthave @uniqx @grote