chore(docker): add missing xml2 headles shell

Author: j-mendez

docker/Dockerfile.headless_shell_playwright

@@ -48,7 +48,7 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
     libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 \
     libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 \
     fonts-liberation libatk-bridge2.0-0 libdrm2 libjpeg-turbo8 fonts-unifont \
-    fonts-ipafont-gothic xfonts-cyrillic xfonts-scalable
+    fonts-ipafont-gothic xfonts-cyrillic xfonts-scalable libxml2
 
 # Add Chrome as a user
 RUN mkdir -p /usr/src/app \