Add Netdata and update docs

docker/.env.example

@@ -40,6 +40,7 @@ BACKUP_DIR=
 
 # netdata
 HOSTNAME=
+NETDATA_PGID=
 
 # gitea
 # you need to create "git" user and group

docker/stacks/netdata/netdata.yml

@@ -0,0 +1,29 @@
+services:
+   netdata:
+      image: netdata/netdata
+      container_name: netdata
+      hostname: ${HOSTNAME}
+      networks:
+         - netdata
+      cap_add:
+         - SYS_PTRACE
+      security_opt:
+         - apparmor:unconfined
+      environment:
+         - PGID=${NETDATA_PGID}
+         - TZ=${TIMEZONE}
+         - DISABLE_TELEMETRY=1
+      volumes:
+         - /etc/passwd:/host/etc/passwd:ro
+         - /etc/group:/host/etc/group:ro
+         - /proc:/host/proc:ro
+         - /sys:/host/sys:ro
+         - /etc/os-release:/host/etc/os-release:ro
+         - /var/run/docker.sock:/var/run/docker.sock:ro
+      ports:
+         - 19999:19999
+      restart: unless-stopped
+
+networks:
+   netdata:
+      name: netdata