add docker-user to groupd

Author: pablomendezroyo

Dockerfile

@@ -3,13 +3,14 @@ FROM docker:dind
 # Install required packages
 RUN apk update && \
     apk add --no-cache xorriso git xz curl ca-certificates iptables cpio bash perl-utils && \
-    # Add user to the existing docker group
-    adduser -S docker-user && \
+    # Create user 'docker-user' and add it to the 'docker' group
+    adduser -S -D -H docker-user && \
     addgroup docker-user docker
 
 WORKDIR /usr/src/app
 COPY . .
 
-USER docker-user  # Ensure the container runs as a non-root user
+# Switch to 'docker-user' to run as a non-root user
+USER docker-user
 
 CMD ["/usr/src/app/iso/scripts/generate_ISO.sh"]