Issue probably from docker new version
i've succeded to build some times ago !
Now i've this issue
Sending build context to Docker daemon 4.608kB Step 1/13 : FROM marsonline/php-apache-pgsql:debian-9 ---> 9122d2c4f11e Step 2/13 : MAINTAINER ali.allaoui@gmail.com ---> Using cache ---> af0121a52922 Step 3/13 : RUN rm /var/www/html/index.html ---> Running in b877c3d6cef4 OCI runtime create failed: container_linux.go:345: starting container process caused "process_linux.go:430: container init caused "rootfs_linux.go:58: mounting \"proc\" to rootfs \"/var/lib/docker/vfs/dir/fc7447bf6bcd5375a58de4d668d62c1eca012371b8d6a0b6b0b81ab285a1091a\" at \"/proc\" caused \"permission denied\""": unknown