[CI]Work around new git security measure.

util/ci/actions/archlinux-test/Dockerfile

@@ -8,5 +8,6 @@ run echo en_US.UTF-8 UTF-8 >> /etc/locale.gen
 run echo en_GB.UTF-8 UTF-8 >> /etc/locale.gen
 run echo fr_FR.UTF-8 UTF-8 >> /etc/locale.gen
 run locale-gen
+run git config --global --add safe.directory /github/workspace
 copy entrypoint.sh /
 entrypoint /entrypoint.sh