Upgrades to PHP 8.3 in Docker image.

Dockerfile

@@ -1,19 +1,18 @@
-FROM php:8.1-apache-bullseye
+FROM php:8.3-apache-bullseye
 
 LABEL org.opencontainers.image.title="LWT Community"
 LABEL org.opencontainers.image.description="An image for LWT"
 LABEL org.opencontainers.image.documentation="https://hugofara.github.io/lwt/docs/"
 LABEL org.opencontainers.image.url="https://hugofara.github.io/lwt/"
-LABEL org.opencontainers.image.author="HugoFara <[email protected]>"
+LABEL org.opencontainers.image.author="HugoFara <[email protected]>"
 LABEL org.opencontainers.image.license=Unlicense
 LABEL org.opencontainers.image.source="https://github.com/HugoFara/lwt"
 
 
 # creating config file php.ini 
 RUN mv "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini" && \
-    echo 'mysqli.allow_local_infile = On' >> "$PHP_INI_DIR/php.ini"
-
-RUN docker-php-ext-install pdo pdo_mysql mysqli
+    echo 'mysqli.allow_local_infile = On' >> "$PHP_INI_DIR/php.ini"; \
+    docker-php-ext-install pdo pdo_mysql mysqli
 
 COPY . /var/www/html/lwt
 
@@ -23,5 +22,9 @@ ARG DB_USER=root
 ARG DB_PASSWORD=root
 ARG DB_DATABASE=learning-with-texts
 
-RUN printf '<?php\n$server = "%s";\n$userid = "%s";\n$passwd = "%s";\n$dbname = "%s";\n?>' "$DB_HOSTNAME" "$DB_USER" "$DB_PASSWORD" "$DB_DATABASE" > /var/www/html/lwt/connect.inc.php
-
+RUN printf '<?php\n$server = "%s";\n$userid = "%s";\n$passwd = "%s";\n$dbname = "%s";\n?>' \
+    "$DB_HOSTNAME" \
+    "$DB_USER" \
+    "$DB_PASSWORD" \
+    "$DB_DATABASE" \
+    > /var/www/html/lwt/connect.inc.php