support setting the secret in env vars

Signed-off-by: fbt <fbt@fleshless.org>

ufw

@@ -56,6 +56,7 @@ usage() {
 
 		    Environment variables:
 		        UFW_CFG_FILE   # Config file to read, defaults to \$XDG_CONFIG_DIR/ufw
+				  UFW_SECRET     # Your API secret
 	EOF
 }
 
@@ -359,6 +360,8 @@ main() {
 	cfg_url_regex='^[A-Za-z]([A-Za-z0-9+.-]+)?://.+'
 	cfg_file=${UFW_CFG_FILE:-"$XDG_CONFIG_DIR/ufw"}
 
+	[[ $UFW_SECRET ]] && secret=$UFW_SECRET
+
 	[[ $1 ]] || { usage; return 1; }
 
 	if [[ -f "$cfg_file" ]]; then