Update Singularity file definition to avoid keyserver errors #388
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keys.gnupg.net has been deprecated now, so I changed it to the ubuntu keyserver keyserver.ubuntu.com.
Also since I was having problems with eduroam, since it blocks most ports (gpg uses 11371 by default), I added explicity the protocol and port number 80. This still works for other networks too.
And for some reason (maybe an upstream change) we needed to fetch another key to get apt to verify the required packages.
This change is