fix(classes.dockerfile): use a single top-level fs import instead of requiring fs inside methods

changelog.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## 2026-01-21 - 1.4.2 - fix(classes.dockerfile)
+use a single top-level fs import instead of requiring fs inside methods
+
+- Added top-level import: import * as fs from 'fs' in ts/classes.dockerfile.ts
+- Removed inline require('fs') calls and replaced with the imported fs in constructor and test() to keep imports consistent
+- No behavioral change expected; this is a cleanup/refactor to standardize module usage
+
 ## 2026-01-20 - 1.4.1 - fix(docs)
 update README: expand usage, installation, quick start, features, troubleshooting and migration notes