fix: permissions on /var/log/amazon directory

Problem:
It's been reported that when the worker-agent installer, running as
root, creates `/var/log/amazon/deadline` that the agent was unable
to write its own logs to that directory when running as a non-root
user.

Solution:
Add go+rx to `/var/log/amazon` -- this is the solution reported to work
by the reporting customer.

Signed-off-by: Daniel Neilson <53624638+ddneilson@users.noreply.github.com>

src/deadline_worker_agent/installer/install.sh

@@ -327,6 +327,7 @@ fi
 # Provision log directory
 echo "Provisioning log directory (/var/log/amazon/deadline)"
 mkdir -p /var/log/amazon/deadline
+chmod 755 /var/log/amazon
 chown -R "${wa_user}:${wa_user}" /var/log/amazon/deadline
 chmod -R 750 /var/log/amazon/deadline
 echo "Done provisioning log directory (/var/log/amazon/deadline)"