Can't 'php artisan migrate' inside docker
Seems that you don't have installed php-MySQL extension in your docker environment
RUN apt-get update \
&& apt-get -y --no-install-recommends install php7.3-mysql php7.3-intl mysql-client php-common openssl zip unzip git \
&& apt-get clean; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /usr/share/doc/*
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
RUN docker-php-ext-install pdo mbstring pdo_mysql
WORKDIR /app
COPY . .
RUN composer install
CMD php artisan serve --host=0.0.0.0
EXPOSE 8000