Hello,
Welcome to bahmni community!
This is an open issue in 0.92 bahmni installation. Please follow below steps before running the installer (before running bahmni -i local install).
yum install https://kojipkgs.fedoraproject.org//packages/zlib/1.2.11/18.fc30/x86_64/zlib-1.2.11-18.fc30.x86_64.rpm
For details on the issue, please follow this thread - Error in installing bahmni 0.92 in vagrant box