yum repository doesn't work because packages are not signed

Set this up on a development system earlier, and look at the last line of output:

$ sudo yum install libvbucket-debuginfo
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package libvbucket-debuginfo.x86_64 0:1.8.0.3-1 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

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Package Arch Version Repository Size
================================================================================
Installing:
libvbucket-debuginfo x86_64 1.8.0.3-1 couchbase 59 k

Transaction Summary
================================================================================
Install 1 Package(s)
Upgrade 0 Package(s)

Total size: 59 k
Is this ok [y/N]: y
Downloading Packages:

Package libvbucket-debuginfo-1.8.0.3-1.x86_64.rpm is not signed