Update Dockerfile

Author: Ekwav

docker/php/Dockerfile

@@ -3,7 +3,6 @@ RUN apt-get update && apt-get install -y \
         libfreetype6-dev \
         libjpeg62-turbo-dev \
         libpng-dev \
-    && docker-php-ext-install -j$(nproc) iconv \
     && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
     && docker-php-ext-install -j$(nproc) gd
     && docker-php-ext-install -j$(nproc) pdo pdo_mysql