adding OBS support

internal/modules/modules.go

@@ -100,6 +100,15 @@ func funcMap() template.FuncMap {
 		// Use this to keep secrets (tokens, passwords) out of modules.yaml.
 		"env": os.Getenv,
 
+		// envDefault returns the value of an environment variable, or
+		// fallback if the variable is empty/unset.
+		"envDefault": func(key, fallback string) string {
+			if v := os.Getenv(key); v != "" {
+				return v
+			}
+			return fallback
+		},
+
 		// expiry converts a duration string like "+1h" to a Unix epoch timestamp string.
 		// Pass "" or "0" to get "0" (no expiry). Supports Go duration syntax (e.g. "30m", "2h").
 		// Note: time.ParseDuration does not support days (d) or weeks (w).