Fix security issues in docker image

According to the latest build by quay.io, there are lots of security issues: https://quay.io/repository/dockstudios/terrareg/manifest/sha256:4e2c8dede5c17cd18f87e3af84fde18fd7d299ef33ff3d722b7bd6c31184af3b?tab=vulnerabilities

Should perform package updates in dockerfile