I trying to configure circleCI config file to do build.
I using external Nexus repository and now have this problem:
gpg: directory '/home/circleci/.gnupg' created
gpg: keybox '/home/circleci/.gnupg/pubring.kbx' created
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
After this chain of links you will find that there are some notes regarding the use of GPG keys which are also detailed with in the source code of the sonatype-nexus-community ORB which can be viewed via the second link.