ci: add lcov dockerfile

tools/ci/amd64/clang/coverage.dockerfile

@@ -0,0 +1,48 @@
+FROM archlinux:latest
+
+RUN pacman -Syu --noconfirm && \
+    pacman -S --noconfirm \
+    bash \
+    base-devel \
+    git \
+    cmake \
+    ninja \
+    python \
+    python-pip \
+    clang \
+    llvm \
+    mesa \
+    mold \
+    ninja \
+    curl \
+    wget \
+    zlib
+
+RUN pip install --no-cache-dir --break-system-packages conan gitpython \
+    && conan profile detect
+
+RUN clang --version  \
+    && pip --version \
+    && conan --version \
+    && cmake --version \
+    && g++ --version \
+    && clang --version \
+    && ninja --version \
+    && mold --version \
+    && llvm-profdata --version \
+    && llvm-cov --version
+
+RUN git clone 'https://git.light7734.com/light7734/light.git' \
+    && cd light; git checkout 'ci/code_cov' \
+    && conan build . \
+        -c tools.system.package_manager:mode=install \
+        -c tools.cmake.cmaketoolchain:generator=Ninja \
+        -c tools.build:compiler_executables='{"c": "clang", "cpp": "clang++"}' \
+        -s build_type=Release \
+        -s compiler=clang \
+        -s compiler.version=20 \
+        -s compiler.libcxx=libc++ \
+        -o use_mold=True \
+        -o enable_lcov=True \
+        --build=missing \
+    && rm -r ../light/