diff --git a/Dockerfile b/Dockerfile
index 4f7dda5..07ed7a5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,13 +11,19 @@ ARG COMPOSER_VERSION=''
 
 ENV NVM_DIR="/home/$USERNAME/.nvm"
 
-ENV DEBIAN_FRONTEND="noninteractive"
+ARG DEBIAN_FRONTEND="noninteractive"
 
 COPY start-container.sh /usr/local/bin/start-container
 
+RUN echo ${DEBIAN_FRONTEND}
+RUN echo ${USERNAME}
+RUN echo ${USER_UID}
+RUN echo $DEBIAN_FRONTEND
+RUN echo $USERNAME
+RUN echo $USER_UID
 RUN apt-get -y update
 RUN apt-get install -y curl git 7zip php php-xml php-curl php-xml php-mbstring php-mysql php-gd
-RUN useradd --create-home --uid=$USER_UID $USERNAME
+RUN useradd --create-home --uid=${USER_UID} ${USERNAME}
 RUN chmod +x /usr/local/bin/start-container
 RUN echo "install composer"
 RUN curl -o composer-setup.php https://getcomposer.org/installer