Add LLVM 15 (#57)

linux-appimage/Dockerfile

@@ -54,6 +54,13 @@ RUN apt-get install -y \
     glslang-tools \
     file
     
+# Install LLVM 15
+RUN wget https://apt.llvm.org/llvm.sh
+RUN chmod +x llvm.sh
+RUN ./llvm.sh 15 all
+RUN update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-15 150
+RUN update-alternatives --install /usr/bin/clang clang /usr/bin/clang-15 150
+
 # Download tools for building AppImages
 RUN wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
 RUN wget https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage

linux-fresh/Dockerfile

@@ -10,10 +10,13 @@ RUN apt-get install -y \
     # Tools
     build-essential \
     ccache \
+    clang \
     clang-format-15 \
     cmake \
     curl \
     git \
+    lld \
+    llvm \
     ninja-build \
     p7zip-full \
     python3-pip \