Enhance Docs for Custom Apps: Base64 Decoding for Testing and Fix 'nginx-entrypoint.sh: No Such File' Issue on Windows only" (#1479)

* Decode the Base64-encoded Environment Variable

* add docs to fix nginx-entrypoint.sh: no such file on windows

* Revert "add docs to fix nginx-entrypoint.sh: no such file on windows"

This reverts commit 395d7cfa3f.

* add docs to fix nginx-entrypoint.sh: no such file on windows

* Fix files according to pre-commit hooks

docs/error-nginx-entrypoint-windows.md

@@ -0,0 +1,12 @@
+# Resolving Docker `nginx-entrypoint.sh` Script Not Found Error on Windows
+
+If you're encountering the error `exec /usr/local/bin/nginx-entrypoint.sh: no such file or directory` in a Docker container on Windows, follow these steps to resolve the issue.
+
+## 1. Check Line Endings
+
+On Windows, files often have `CRLF` line endings, while Linux systems expect `LF`. This can cause issues when executing shell scripts in Linux containers.
+
+- **Convert Line Endings using `dos2unix`:**
+  ```bash
+  dos2unix resources/nginx-entrypoint.sh
+  ```