add chromium wrapper

Dockerfile

@@ -7,11 +7,9 @@ RUN set -eux; \
   apt-get update; \
   apt-get install -y --no-install-recommends \
     wget gnupg ca-certificates curl unzip \
-    # Chrome runtime deps
     libnss3 libxss1 libx11-xcb1 libxcomposite1 libxdamage1 libxext6 libxfixes3 \
     libxkbcommon0 libxrandr2 libatk1.0-0 libatk-bridge2.0-0 libgtk-3-0 \
     libgbm1 libasound2 fonts-liberation \
-    # Optional fonts for broader charset support
     fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf; \
   wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | gpg --dearmor -o /usr/share/keyrings/google-linux.gpg; \
   echo "deb [arch=amd64 signed-by=/usr/share/keyrings/google-linux.gpg] http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list; \
@@ -19,39 +17,44 @@ RUN set -eux; \
   apt-get install -y --no-install-recommends google-chrome-stable; \
   rm -rf /var/lib/apt/lists/*
 
-# Prevent Puppeteer from downloading Chromium, point to system Chrome
+# Prevent Puppeteer from downloading Chromium
 ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
-ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/google-chrome-stable
 
-# Default Chrome args suitable for containers (headless + no sandbox)
-ENV CHROME_DEFAULT_ARGS="--no-sandbox --disable-setuid-sandbox --headless=new --disable-gpu --disable-dev-shm-usage --no-zygote --no-first-run --ozone-platform=none --disable-features=UseOzonePlatform --enable-features=NetworkService,NetworkServiceInProcess"
+# Force flags via a wrapper so Chrome cannot try X11 or sandbox
+RUN printf '%s\n' \
+'#!/usr/bin/env bash' \
+'exec /usr/bin/google-chrome-stable \' \
+'  --no-sandbox --disable-setuid-sandbox \' \
+'  --headless=new --disable-gpu --disable-dev-shm-usage \' \
+'  --no-zygote --no-first-run \' \
+'  --ozone-platform=none --disable-features=UseOzonePlatform \' \
+'  "$@"' \
+> /usr/local/bin/chrome-wrapper && chmod +x /usr/local/bin/chrome-wrapper
 
-# Env consumed by lowlighter/metrics to pass browser flags
+# Point puppeteer to the wrapper
+ENV PUPPETEER_EXECUTABLE_PATH=/usr/local/bin/chrome-wrapper
+
+# Optional envs used by metrics (kept for completeness)
 ENV METRICS_BROWSER=chromium
 ENV METRICS_BROWSER_HEADLESS=true
 ENV METRICS_BROWSER_ARGS=""
-
-# Optional: trust reverse proxy for express-rate-limit
 ENV METRICS_TRUST_PROXY=1
 
-# Copy sources and install JS deps
+# Install JS deps
 COPY package.json package-lock.json* ./
 RUN npm ci
 
+# Copy source and build
 COPY . .
-
-# Build the project
 RUN npm run build
 
-# Wrapper entrypoint to ensure args are always set
+# Entry
 RUN printf '%s\n' \
 '#!/usr/bin/env bash' \
 'set -euo pipefail' \
-'export PUPPETEER_EXECUTABLE_PATH="${PUPPETEER_EXECUTABLE_PATH:-/usr/bin/google-chrome-stable}"' \
-'export METRICS_BROWSER="${METRICS_BROWSER:-chromium}"' \
-'export METRICS_BROWSER_HEADLESS="${METRICS_BROWSER_HEADLESS:-true}"' \
+# Ensure METRICS_BROWSER_ARGS has flags if the app reads it (not strictly needed with wrapper)
 'if [ -z "${METRICS_BROWSER_ARGS:-}" ]; then' \
-'  export METRICS_BROWSER_ARGS="${CHROME_DEFAULT_ARGS}"' \
+'  export METRICS_BROWSER_ARGS="--no-sandbox --disable-setuid-sandbox --headless=new --disable-gpu --disable-dev-shm-usage --no-zygote --no-first-run --ozone-platform=none --disable-features=UseOzonePlatform --enable-features=NetworkService,NetworkServiceInProcess"' \
 'fi' \
 'exec npm start' \
 > /usr/local/bin/metrics-entrypoint && chmod +x /usr/local/bin/metrics-entrypoint