Update .env.sample

Author: evertramos

.env.sample

@@ -144,3 +144,15 @@ DEFAULT_HOST=
 # For example DOCKER_HOST_PATH=$XDG_RUNTIME_DIR/docker.sock
 # If you are not using Docker Rootless, leave this variable blank
 DOCKER_HOST_ROOTLESS_PATH=
+
+#-----------------------------------------------------------------------
+#
+# Cloudflare API Token
+#
+# Despite nginx-proxy suggest the usage of global API keys, 
+# I rather use a more restrict API token which you can follow 
+# the steps to create it with Zone DNS restriction as documented.
+#
+# https://github.com/evertramos/nginx-proxy-automation/blob/main/docs/cloudflare.md 
+# 
+CLOUDFLARE_DNS_TOKEN=