mysqld start => Start the mysql Daemon (in case if the mysql service doesn't start initially. This saved me..!)
mysql_secure_installation => Initialises mysql users & DB if not setup earlier
PHP Error Display is turned ON. Disable it, if using for production.
Try the following if you are not able to change the PHP upload limit:
4.1) Create the file - uploads.ini with the following contents:
file_uploads = On
memory_limit = 64M
upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 600
4.2) Link the file while running container: -v ~/Documents/uploads.ini:/etc/php/7.0/apache2/php.ini