Upgrade the PHP Apache image to 8.4 on Trixie

Dockerfile

@@ -1,22 +1,8 @@
 # Use PHP with Apache as base image
-FROM php:8.0-apache
+FROM php:8.4-apache-trixie
 
 # Install system dependencies
-# Bullseye LTS ended on 2026-08-31; no further official security updates are planned.
-# Third-party Extended LTS may support selected packages separately:
-# https://www.debian.org/News/2026/20260831
-# Restore reliable build downloads using archive.debian.org for bullseye and
-# bullseye-updates, plus the fixed 2026-09-01 snapshot for bullseye-security.
-# The snapshot avoids live-mirror package 404s and retains final LTS versions.
-# It does not extend Debian 11 security support. Any later fix requires changing
-# these sources; rebuilding cannot fetch updates beyond the fixed snapshot.
-# check-valid-until=no skips only snapshot metadata expiry; signature and checksum
-# verification remain enabled. See https://snapshot.debian.org/
-RUN sed -i \
-        -e 's|deb\.debian\.org/debian |archive.debian.org/debian |g' \
-        -e 's|http://deb\.debian\.org/debian-security |[check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20260901T000000Z/ |g' \
-        /etc/apt/sources.list && \
-    apt-get update && apt-get install -y \
+RUN apt-get update && apt-get install -y \
     libcurl4-openssl-dev \
     curl \
     && rm -rf /var/lib/apt/lists/*