[libxml2]Add libxml2 library

libxml2/.gitlab-ci/Dockerfile

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+# The image is also used for libxslt.
+#
+# package           required for
+# ------------------------------------------------------------
+# libclang-rt-dev   sanitizer runtimes
+# llvm              llvm-symbolizer (for sanitizer backtraces)
+# git               libxslt, downstream projects
+# libgcrypt-dev     libxslt
+# xz-utils          make dist
+# doxygen           documentation
+# xsltproc          documentation
+# docbook-xsl       documentation
+
+FROM ubuntu:26.04
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && \
+    apt-get upgrade -y && \
+    apt-get install -y --no-install-recommends \
+        curl git ca-certificates \
+        autoconf automake libtool pkg-config \
+        make gcc clang llvm libclang-rt-dev \
+        zlib1g-dev libgcrypt-dev \
+        python3-dev \
+        cmake meson \
+        xz-utils \
+        doxygen xsltproc docbook-xsl
+WORKDIR /tests
+RUN curl https://www.w3.org/XML/Test/xmlts20080827.tar.gz |tar xz
+
+# XML::LibXML uses Alien::Libxml2 which has a huge dependency chain.
+# We try to install most dependencies with apt. We also require
+# libxml2-dev to stop Alien::Libxml2 from downloading and building
+# libxml2 on its own.
+RUN apt-get install -y --no-install-recommends \
+        libperl-dev libxml2-dev cpanminus \
+        libalien-build-perl \
+        libio-socket-ssl-perl \
+        libsort-versions-perl \
+        liburi-perl \
+        libxml-namespacesupport-perl  \
+        libxml-sax-perl \
+        libyaml-perl
+RUN cpanm -n Alien::Libxml2
+RUN apt-get remove -y libxml2-dev
+
+# PHP
+RUN apt-get install -y --no-install-recommends \
+        bison re2c libsqlite3-dev
+
+# lxml
+# ubuntu cython3 is too old, so we install using pip
+RUN apt-get install -y --no-install-recommends \
+        python3-pip
+RUN pip3 install Cython --break-system-packages
+
+# xmlstarlet
+RUN apt-get install -y --no-install-recommends \
+        docbook-xsl-ns