Github action: Fix build on Ubuntu 22.04

Author: joto

.github/workflows/ci.yml

@@ -30,6 +30,7 @@ jobs:
             image: "ubuntu:22.04"
             ubuntu: 22
             installer: apt
+            CXXFLAGS: -Wno-stringop-overread
           - name: Debian-9
             # Uses gcc 6.3.0, clang 3.8.1, cmake 3.7.2
             image: "debian:stretch"