chore: add missing env

Author: l4rm4nd

examples/crowdsec/docker-compose.yml

@@ -17,6 +17,7 @@ services:
       - GID=1000
       - BOUNCER_KEY_TRAEFIK=${CROWDSEC-BOUNCER-API-TOKEN:-FIXME-LAPI-KEY}
       - COLLECTIONS=crowdsecurity/traefik crowdsecurity/http-cve crowdsecurity/appsec-generic-rules crowdsecurity/appsec-virtual-patching
+      #- CUSTOM_HOSTNAME=crowdsec-host123
     #security_opt:
     #  - no-new-privileges=true      
     #networks: