Fix 3

Author: learn-more

docker/web/Dockerfile

@@ -4,7 +4,7 @@ RUN apt-get update && apt-get install -y \
         libldap2-dev \
         libonig-dev \
     && docker-php-ext-configure ldap \
-    && docker-php-ext-install mysqli ldap mbstring \
+    && docker-php-ext-install mysqli pdo_mysql ldap mbstring \
     && a2enmod rewrite \
     && rm -rf /var/lib/apt/lists/*