build: Install extensions using the official PHP recommended method.

Dockerfile

@@ -1,7 +1,16 @@
 FROM php:8.1-apache
 
-RUN apt update && apt install -y php-intl php-gettext php-openssl php-filter php-tokenizer php-pdo \
-                php-mysqlnd php-pgsql php-sqlite3
+RUN apt-get update && apt-get install -y \
+    libicu-dev \
+    libssl-dev \
+    libsqlite3-dev \
+    libpq-dev \
+    gettext
+
+RUN docker-php-ext-install -j$(nproc) \
+    intl \
+    gettext \
+    pdo_pgsql
 
 COPY entrypoint.sh /usr/local/bin/entrypoint.sh
 RUN chmod +x /usr/local/bin/entrypoint.sh