Docker file move from COPY to ADD (sec recomendations)

Dockerfile

@@ -224,11 +224,11 @@ RUN echo @testing http://nl.alpinelinux.org/alpine/edge/testing >> /etc/apk/repo
 #    apk del .sys-deps
 #    ln -s /usr/bin/php7 /usr/bin/php
 
-ADD conf/supervisord.conf /etc/supervisord.conf
+COPY conf/supervisord.conf /etc/supervisord.conf
 
 # Copy our nginx config
 RUN rm -Rf /etc/nginx/nginx.conf
-ADD conf/nginx.conf /etc/nginx/nginx.conf
+COPY conf/nginx.conf /etc/nginx/nginx.conf
 
 # nginx site conf
 RUN mkdir -p /etc/nginx/sites-available/ && \
@@ -236,8 +236,8 @@ mkdir -p /etc/nginx/sites-enabled/ && \
 mkdir -p /etc/nginx/ssl/ && \
 rm -Rf /var/www/* && \
 mkdir /var/www/html/
-ADD conf/nginx-site.conf /etc/nginx/sites-available/default.conf
-ADD conf/nginx-site-ssl.conf /etc/nginx/sites-available/default-ssl.conf
+COPY conf/nginx-site.conf /etc/nginx/sites-available/default.conf
+COPY conf/nginx-site-ssl.conf /etc/nginx/sites-available/default-ssl.conf
 RUN ln -s /etc/nginx/sites-available/default.conf /etc/nginx/sites-enabled/default.conf
 
 ## disabled due to license changes (to fix in next release)
@@ -273,16 +273,16 @@ RUN echo "cgi.fix_pathinfo=0" > ${php_vars} &&\
 
 
 # Add Scripts
-ADD scripts/start.sh /start.sh
-ADD scripts/pull /usr/bin/pull
-ADD scripts/push /usr/bin/push
-ADD scripts/letsencrypt-setup /usr/bin/letsencrypt-setup
-ADD scripts/letsencrypt-renew /usr/bin/letsencrypt-renew
+COPY scripts/start.sh /start.sh
+COPY scripts/pull /usr/bin/pull
+COPY scripts/push /usr/bin/push
+COPY scripts/letsencrypt-setup /usr/bin/letsencrypt-setup
+COPY scripts/letsencrypt-renew /usr/bin/letsencrypt-renew
 RUN chmod 755 /usr/bin/pull && chmod 755 /usr/bin/push && chmod 755 /usr/bin/letsencrypt-setup && chmod 755 /usr/bin/letsencrypt-renew && chmod 755 /start.sh
 
 # copy in code
-ADD src/ /var/www/html/
-ADD errors/ /var/www/errors
+COPY src/ /var/www/html/
+COPY errors/ /var/www/errors
 
 
 EXPOSE 443 80