Netdata: update config

map /etc/hostname config into container

files/netdata/docker-compose.template.yml

@@ -16,12 +16,16 @@ services:
       - "{{ config_dir }}:/etc/netdata"
       - "{{ (data_dir, 'lib') | path_join }}:/var/lib/netdata"
       - "{{ (data_dir, 'cache') | path_join }}:/var/cache/netdata"
+
       # Netdata system volumes
       - "/:/host/root:ro,rslave"
+
       - "/etc/group:/host/etc/group:ro"
+      - "/etc/hostname:/host/etc/hostname:ro"
       - "/etc/localtime:/etc/localtime:ro"
       - "/etc/os-release:/host/etc/os-release:ro"
       - "/etc/passwd:/host/etc/passwd:ro"
+
       - "/proc:/host/proc:ro"
       - "/run/dbus:/run/dbus:ro"
       - "/sys:/host/sys:ro"