laravel as a docker-compose service - [QueryException] could not find driver - laravel

Question

I create a container for my laravel project using this dockerfile:
FROM composer:1.8
RUN apk add --no-cache libpng libpng-dev libjpeg-turbo-dev libwebp-dev zlib-dev libxpm-dev
RUN docker-php-ext-install pdo mbstring gd
RUN docker-php-ext-enable gd
WORKDIR /app
COPY . /app
RUN composer install
CMD php artisan serve --host=0.0.0.0 --port=8181
EXPOSE 8181
then I try to use it as a service inside a docker-compose.yml file:
version: '3'
services:
webservice:
image: private.repo.com/my_user/webservice
ports:
- '80:8181'
depends_on:
- mariadb
mariadb:
image: mariadb
volumes:
- './db:/var/lib/mysql'
environment:
- MYSQL_ROOT_PASSWORD=some_password
phpmyadmin:
image: phpmyadmin/phpmyadmin
depends_on:
- mariadb
ports:
- '443:80'
environment:
- PMA_HOST=mariadb
- PMA_PORT=3306
now I am getting error 500 when I want to call my APIs.
(error is [QueryException] could not find driver)
I searched about it and all I found is that it usually about happens because there is something wrong with .env file
this is my .env file in laravel project
DB_CONNECTION=mysql
DB_HOST=mariadb
DB_PORT=3306
DB_DATABASE=my_db_name
DB_USERNAME=my_db_user
DB_PASSWORD=my_db_pass
the DB_HOST is the same as my docker-compose.yml file.
I also tried to exporting port 3306 in my mariadb service but it didn't work either
where did I go wrong, pls help
-----------update-----------
I also checked the ip of mariadb service and put it on my service container (while they both working, without shutting them down) but the problem remains.

Answer 1

it was actually pretty simple.
I had to installed pdo_mysql too
now my docker file is like this:
FROM composer:1.8
RUN apk add --no-cache libpng libpng-dev libjpeg-turbo-dev libwebp-dev zlib-dev libxpm-dev
RUN docker-php-ext-install pdo mbstring gd pdo_mysql # this line is changed
RUN docker-php-ext-enable gd
WORKDIR /app
COPY . /app
RUN composer install
CMD php artisan serve --host=0.0.0.0 --port=8181
EXPOSE 8181
I found the solution here: https://github.com/docker-library/php/issues/62#issuecomment-70306737