Generate Self signed Certificate

sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout custom.key -out custom.crt

Add new php8 extension

docker exec -it php8-fpm /bin/sh

apk update

apk add zip libzip-dev php8-mysqli 
docker-php-ext-install zip mysqli

apk add php8-(new extension)

cp /usr/lib/php8/modules/(new extension).so /usr/local/lib/php/extensions/no-debug-non-zts-20200930/

vim /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini

cp /usr/local/etc/php/php.ini-production /usr/local/etc/php/php.ini

vim /usr/local/etc/php/php.ini

set maximum file size for upload set timezone

php -m 

to review installed extension