[dockers][platform-monitor] Add chassis_db_init to platform monitor t…

…asks (#7596)

I added `chassis_db_init` to the startup tasks for the `docker-platform-monitor` docker so that the script is run on startup of the switch and the chassis info is correctly provisioned to STATE_DB.

Depends on sonic-net/sonic-platform-daemons#183

dockers/docker-platform-monitor/docker-pmon.supervisord.conf.j2

@@ -41,6 +41,17 @@ dependent_startup=true
 dependent_startup_wait_for=rsyslogd:running
 {% endif %}
 
+[program:chassis_db_init]
+command=/usr/local/bin/chassis_db_init
+priority=3
+autostart=false
+autorestart=false
+stdout_logfile=syslog
+stderr_logfile=syslog
+startsecs=0
+dependent_startup=true
+dependent_startup_wait_for=rsyslogd:running
+
 {% if not skip_sensors and HAVE_SENSORS_CONF == 1 %}
 [program:lm-sensors]
 command=/usr/bin/lm-sensors.sh