prevent plugin volume to have ownerships overwritten by docker

srcs/requirements/nginx/Dockerfile

@@ -23,9 +23,16 @@ RUN adduser -S www-data && \
 # ARG variables are not persistent after the build process, in opposite to ENV
 ARG WP_URL
 ARG WP_VOLUME_DIR
+ARG WP_VOLUME_PLUGINS
 ARG NG_CERTS_DIR
 ARG SERVER_MAX_UPLOAD_SIZE
 
+# IS IT USEFUL ?
+# # create and empty volumes dir
+# RUN mkdir -p ${WP_VOLUME_DIR}   ${WP_VOLUME_PLUGINS}   && \
+# 	rm -rf     ${WP_VOLUME_DIR}/* ${WP_VOLUME_PLUGINS}/*
+
+
 # replace WP_URL
 RUN sed -i "s/\${WP_URL}/${WP_URL}/g" /etc/nginx/http.d/nginx_http_server.conf
 # replace max file size upload