add clang 18

Dockerfile

@@ -10,6 +10,11 @@ RUN \
   apt-get -y upgrade && \
   apt-get install -y rename build-essential zstd ninja-build ca-certificates pkg-config binutils-dev software-properties-common git wget curl liblua5.2-0 libfontconfig python3-dev libcurl4-openssl-dev valgrind libdw-dev libiberty-dev zlib1g-dev doxygen python3-pip freeglut3-dev libglew-dev libglu1-mesa-dev libgl1-mesa-dev libssl-dev clang
 
+RUN \
+  wget https://apt.llvm.org/llvm.sh && \
+  chmod u+x llvm.sh && \
+  ./llvm.sh 18
+
 RUN \
   wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | gpg --dearmor - | tee /usr/share/keyrings/kitware-archive-keyring.gpg >/dev/null && \
   echo 'deb [signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] https://apt.kitware.com/ubuntu/ jammy main' | tee /etc/apt/sources.list.d/kitware.list >/dev/null && \
@@ -21,6 +26,7 @@ RUN \
 
 RUN \
   apt-get update && \
+  apt-get -y upgrade && \
   apt-get install -y kitware-archive-keyring && \
   apt-get install -y nodejs gh cmake