chore(NA): use env var to point config folder on os_packages built with fpm (#67433)

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

src/core/server/path/index.ts

@@ -28,7 +28,6 @@ const CONFIG_PATHS = [
   process.env.KIBANA_PATH_CONF && join(process.env.KIBANA_PATH_CONF, 'kibana.yml'),
   process.env.CONFIG_PATH, // deprecated
   fromRoot('config/kibana.yml'),
-  '/etc/kibana/kibana.yml',
 ].filter(isString);
 
 const DATA_PATHS = [

src/dev/build/tasks/os_packages/service_templates/sysv/etc/default/kibana

@@ -11,3 +11,5 @@ nice=""
 KILL_ON_STOP_TIMEOUT=0
 
 BABEL_CACHE_PATH="/var/lib/kibana/optimize/.babel_register_cache.json"
+
+KIBANA_PATH_CONF="/etc/kibana"

src/dev/build/tasks/os_packages/service_templates/sysv/etc/init.d/kibana

@@ -23,6 +23,7 @@ pidfile="/var/run/$name.pid"
 [ -r /etc/default/$name ] && . /etc/default/$name
 [ -r /etc/sysconfig/$name ] && . /etc/sysconfig/$name
 
+export KIBANA_PATH_CONF
 export NODE_OPTIONS
 
 [ -z "$nice" ] && nice=0