use php 8.1 and add gd and pdo extensions (#7)

Author: jlucki

docker/Dockerfile

@@ -1,8 +1,15 @@
-FROM php:8.0-fpm
+FROM php:8.1-fpm
 
 ARG WITH_XDEBUG=true
 
-RUN docker-php-ext-install mysqli; \
+RUN apt-get update && apt-get install -y \
+        libfreetype6-dev \
+        libjpeg62-turbo-dev \
+        libpng-dev \
+    && docker-php-ext-configure gd --with-freetype --with-jpeg \
+    && docker-php-ext-install -j$(nproc) gd \
+    && docker-php-ext-install mysqli \
+    && docker-php-ext-install pdo pdo_mysql; \
     if [ $WITH_XDEBUG = "true" ] ; then \
         pecl install xdebug; \
     fi ;