fix: update Dockerfile to fix build error

- Add proper USER commands
- Add set -ex for better error handling
- Fix apache2-utils installation

Dockerfile

@@ -1,6 +1,10 @@
 FROM registry:2
 
+USER root
 # Install Apache utilities for htpasswd management
-RUN apt-get update && apt-get install -y \
-    apache2-utils \
-    && rm -rf /var/lib/apt/lists/*
+RUN set -ex \
+    && apt-get update \
+    && apt-get install -y apache2-utils \
+    && rm -rf /var/lib/apt/lists/*
+
+USER nobody