Fix directories.

Dockerfile

@@ -1,6 +1,5 @@
 FROM php:7.4-apache AS base
-ENV APACHE_DOCUMENT_ROOT /var/www/html
+WORKDIR /var/www/html
-WORKDIR ${APACHE_DOCUMENT_ROOT}
 
 RUN apt update && \
     apt install -y \
@@ -21,7 +20,7 @@ RUN docker-php-ext-install \
     pdo_mysql
 
 FROM composer:2 AS build
-WORKDIR ${APACHE_DOCUMENT_ROOT}
+WORKDIR /var/www/html
 
 COPY composer.json .
 COPY composer.lock .
@@ -31,7 +30,7 @@ COPY . .
 RUN composer dumpautoload --optimize
 
 FROM base AS final
-COPY --from=build ${APACHE_DOCUMENT_ROOT} ${APACHE_DOCUMENT_ROOT}
+COPY --from=build /var/www/html /var/www/html
 
 RUN sed -ri -e 's!/var/www/!/var/www/html!g' /etc/apache2/apache2.conf /etc/apache2/conf-available/*.conf
 RUN sed -ri -e 's!AllowOverride None!AllowOverride All!g' /etc/apache2/apache2.conf
@@ -39,6 +38,6 @@ RUN sed -ri -e 's!AllowOverride None!AllowOverride All!g' /etc/apache2/apache2.c
 RUN mv "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini"
 RUN sed -ri -e 's!upload_max_filesize = 2M!upload_max_filesize = 8M!g' $PHP_INI_DIR/php.ini
 
-RUN chown -R www-data:www-data ${APACHE_DOCUMENT_ROOT}
+RUN chown -R www-data:www-data /var/www/html
 
-VOLUME ${APACHE_DOCUMENT_ROOT}
+VOLUME /var/www/html