Updated Dockerfile to fix issue with php 7.4 image

cf. docker-library/php#912

Author: SigmaConso

Dockerfile

@@ -1,4 +1,4 @@
-FROM php:apache
+FROM php:8.0-apache
 
 RUN apt-get update && apt-get install -y \
         libfreetype6-dev \
@@ -8,7 +8,7 @@ RUN apt-get update && apt-get install -y \
         zip \
         unzip && \
     # We install and enable php-gd
-    docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ &&\
+    docker-php-ext-configure gd --with-freetype --with-jpeg &&\
     docker-php-ext-install -j$(nproc) gd && \
     # We enable Apache's mod_rewrite
     a2enmod rewrite