CI: Switch to zstd-compressed LDC-LLVM tarballs

Author: kinke

.github/actions/1-setup/action.yml

@@ -24,7 +24,7 @@ runs:
         packages=( \
           git-core cmake g++ \
           libcurl4 libzstd-dev \
-          curl gdb p7zip-full tzdata unzip zip python3-pip \
+          curl gdb p7zip-full zstd tzdata unzip zip python3-pip \
         )
         if [[ $arch == x86_64 ]]; then
           packages+=(g++-multilib libcurl4:i386)
@@ -111,11 +111,11 @@ runs:
           elif [[ '${{ runner.os }}' == macOS ]]; then
             os=osx
           fi
-          curl -fL --retry 3 --max-time 300 -o llvm.tar.xz \
-            https://github.com/ldc-developers/llvm-project/releases/download/$tag/llvm-$version-$os-$arch$assertsSuffix.tar.xz
+          curl -fL --retry 3 --max-time 300 -o llvm.tar.zst \
+            https://github.com/ldc-developers/llvm-project/releases/download/$tag/llvm-$version-$os-$arch$assertsSuffix.tar.zst
           mkdir llvm
-          tar -xf llvm.tar.xz --strip 1 -C llvm
-          rm llvm.tar.xz
+          tar -xf llvm.tar.zst --zstd --strip 1 -C llvm
+          rm llvm.tar.zst
         fi
 
         llvm/bin/llvm-config --version

.github/actions/3-build-cross/action.yml

@@ -45,11 +45,11 @@ runs:
           fi
         fi
 
-        curl -fL --retry 3 --max-time 300 -o llvm-cross.tar.xz \
-          https://github.com/ldc-developers/llvm-project/releases/download/$tag/llvm-$version-${{ inputs.os }}-${{ inputs.arch }}$assertsSuffix.tar.xz
+        curl -fL --retry 3 --max-time 300 -o llvm-cross.tar.zst \
+          https://github.com/ldc-developers/llvm-project/releases/download/$tag/llvm-$version-${{ inputs.os }}-${{ inputs.arch }}$assertsSuffix.tar.zst
         mkdir llvm-cross
-        tar -xf llvm-cross.tar.xz --strip 1 -C llvm-cross
-        rm llvm-cross.tar.xz
+        tar -xf llvm-cross.tar.zst --zstd --strip 1 -C llvm-cross
+        rm llvm-cross.tar.zst
 
     - name: Make non-native llvm-config runnable on host
       shell: bash

.github/workflows/main.yml

@@ -14,7 +14,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  LLVM_VERSION: 21.1.8
+  LLVM_VERSION: e7130c48
 
 jobs:
   build-native: