tini is a hyper-minimal PID 0 which spawns a child process (watchfrr.sh
in our case), reaps zombies and forwards signals to the script. Starting
watchfrr.sh directly instead of through the old `tail /dev/null` or
`sleep 365d` helps keep things clean too :)
While tini was previously only used in the Alpine container it is useful
to apply this PID 0 to all containers except the special CI ones.
Fixes: #8788
Signed-off-by: Wesley Coakley <w@wesleycoakley.com>
If we can chown /etc/frr then fine, but there's circumstances where we
won't be able to - for instance, if running FRR in Kubernetes where
/etc/frr/* is actually a virtual filesystem.
Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
