Remove Yarn repository to prevent expired GPG key failures (#7)

* Initial plan

* Add preventive fix for Yarn GPG key expiration issue

Co-authored-by: mglaman <3698644+mglaman@users.noreply.github.com>

* Address code review feedback - simplify Yarn repository cleanup

Co-authored-by: mglaman <3698644+mglaman@users.noreply.github.com>

* Optimize Dockerfile by combining Yarn cleanup with Node.js installation

Co-authored-by: mglaman <3698644+mglaman@users.noreply.github.com>

* Clarify comments about Yarn GPG key fix

Co-authored-by: mglaman <3698644+mglaman@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mglaman <3698644+mglaman@users.noreply.github.com>

Author: Copilot

Dockerfile

@@ -2,8 +2,11 @@
 FROM php:8.3-apache AS base
 
 # Install Node.js 24 (includes npm)
+# Clean up Yarn repository to prevent GPG key expiration errors
+# Yarn's GPG key (23E7166788B63E1E) has expired, causing apt-get failures if repository is present
 RUN curl -fsSL https://deb.nodesource.com/setup_24.x | bash - && \
-    apt-get install -y --no-install-recommends nodejs
+    apt-get install -y --no-install-recommends nodejs && \
+    rm -f /etc/apt/sources.list.d/yarn.list /usr/share/keyrings/yarnkey.gpg
 
 RUN apt-get install -y --no-install-recommends \
     libsodium-dev \