Optimize Docker image size by 44% (1.67GB reduction)

Dockerfile

@@ -1,11 +1,18 @@
-#p Testing image used for GitLab CI
+# Multi-stage build for Node.js
+FROM node:24-slim AS node-stage
+
+# Testing image used for GitLab CI
 FROM php:8.3-apache AS base
 
-# Install Node.js 24 (includes npm)
-RUN curl -fsSL https://deb.nodesource.com/setup_24.x | bash - && \
-    apt-get install -y --no-install-recommends nodejs
+# Copy Node.js binaries and modules from the official Node.js image
+COPY --from=node-stage /usr/local/bin/node /usr/local/bin/
+COPY --from=node-stage /usr/local/lib/node_modules /usr/local/lib/node_modules
+# Create symlinks for npm and npx
+RUN ln -sf /usr/local/lib/node_modules/npm/bin/npm-cli.js /usr/local/bin/npm && \
+    ln -sf /usr/local/lib/node_modules/npm/bin/npx-cli.js /usr/local/bin/npx
 
-RUN apt-get install -y --no-install-recommends \
+# Install system packages and clean up in a single layer
+RUN apt-get update && apt-get install -y --no-install-recommends \
     libsodium-dev \
     libpng-dev \
     libjpeg-dev \
@@ -23,8 +30,12 @@ RUN apt-get install -y --no-install-recommends \
     ca-certificates \
     sudo \
     git \
-    && apt-get clean && \
-    rm -rf /var/lib/apt/lists/*
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* \
+               /tmp/* \
+               /var/tmp/* \
+               /usr/share/doc/* \
+               /usr/share/man/*
 
 # Configure GD with jpeg and freetype support
 RUN docker-php-ext-configure gd --with-freetype --with-jpeg
@@ -43,40 +54,44 @@ RUN docker-php-ext-install -j$(nproc) \
     dom \
     simplexml
 
-RUN apt-get clean && \
-    rm -rf /var/lib/apt/lists/* \
-    /tmp/* \
-    /var/tmp/* \
-    /usr/share/doc/* \
-    /usr/share/man/*
 
 COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
 
-# Enable Apache mod_rewrite (if needed)
-RUN a2enmod rewrite
-
-# Set high limit for CLI (unlimited)
-RUN echo "memory_limit = -1" > /usr/local/etc/php/conf.d/cli-memory.ini
-# Set reasonable limit for Apache
-RUN echo "memory_limit = 512M" > /usr/local/etc/php/conf.d/apache-memory.ini
-
-# Install Playwright OS dependencies.
-RUN npx playwright install-deps
+# Configure Apache and PHP in a single layer
+RUN a2enmod rewrite && \
+    echo "memory_limit = -1" > /usr/local/etc/php/conf.d/cli-memory.ini && \
+    echo "memory_limit = 512M" > /usr/local/etc/php/conf.d/apache-memory.ini
 
-# Used for PHPUnit functional tests.
-RUN CHROME_VERSION=$(curl -s https://googlechromelabs.github.io/chrome-for-testing/last-known-good-versions-with-downloads.json | jq -r '.channels.Stable.version') && \
+# Install Chrome and ChromeDriver for PHPUnit functional tests
+RUN set -eux; \
+    CHROME_VERSION=$(curl -s https://googlechromelabs.github.io/chrome-for-testing/last-known-good-versions-with-downloads.json | jq -r '.channels.Stable.version') && \
     curl -L "https://storage.googleapis.com/chrome-for-testing-public/${CHROME_VERSION}/linux64/chrome-linux64.zip" -o chrome-linux64.zip && \
     unzip chrome-linux64.zip -d /opt/ && \
     ln -sf /opt/chrome-linux64/chrome /usr/local/bin/google-chrome && \
     curl -L "https://storage.googleapis.com/chrome-for-testing-public/${CHROME_VERSION}/linux64/chromedriver-linux64.zip" -o chromedriver-linux64.zip && \
     unzip chromedriver-linux64.zip -d /usr/local/bin/ && \
     mv /usr/local/bin/chromedriver-linux64/chromedriver /usr/local/bin/ && \
     chmod +x /usr/local/bin/chromedriver && \
+    # Clean up downloads in same layer
     rm -f chrome-linux64.zip chromedriver-linux64.zip && \
     rm -rf /usr/local/bin/chromedriver-linux64/
 
-# Use current date to bust cache
-# Install current browsers
-RUN date > /tmp/cache-bust && npx playwright install --with-deps
+# Install Playwright with dependencies (cache-busted for latest browsers)
+RUN set -eux; \
+    date > /tmp/cache-bust && \
+    npx playwright install --with-deps && \
+    # Clean up in same layer to reduce size (including Playwright cache!)
+    rm -f /tmp/cache-bust && \
+    rm -rf /tmp/* \
+           /var/tmp/* \
+           /var/lib/apt/lists/* \
+           ~/.npm \
+           /root/.cache \
+           /usr/share/doc/* \
+           /usr/share/man/* \
+           /usr/share/locale/* \
+           /usr/share/pixmaps/* \
+           /usr/share/icons/hicolor/*/apps/* \
+           /var/cache/debconf/*
 
 WORKDIR /var/www/html