[mod] netdata use .env HOSTNAME

netdata/docker-compose.yml

@@ -3,7 +3,7 @@ services:
   netdata:
     image: netdata/netdata
     container_name: netdata
-    #hostname: example.com # set to fqdn of host
+    hostname: "${HOSTNAME}" # set to fqdn of host
     ports:
       - 19999:19999
     restart: unless-stopped

netdata/readme.md

@@ -0,0 +1,2 @@
+Requires .env e.g.
+HOSTNAME=omv.local