fbeae4ffeb
Scylla built using the frozen toolchain needs to be debugged on a system with matching libraries. It's easiest if it's also done on the same image. Install gdb in the image so that it's always out there when we need it. Fixes #4329 Message-Id: <1553072393-9145-1-git-send-email-tgrabiec@scylladb.com>