Don't install llvm during job

Author: RossBrunton

.github/workflows/ur-build-offload.yml

@@ -22,11 +22,7 @@ jobs:
       uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
     - name: Install liboffload
-      run: |
-        sudo curl -sSL https://apt.llvm.org/llvm-snapshot.gpg.key -o /etc/apt/trusted.gpg.d/apt.llvm.org.asc
-        echo 'deb http://apt.llvm.org/noble/ llvm-toolchain-noble main' | sudo tee /etc/apt/sources.list.d/llvm.list
-        sudo apt-get update
-        sudo apt-get -y install liboffload-21 liboffload-21-dev
+      run: sudo apt-get update -qq && sudo apt-get install --no-install-recommends -yqq liboffload-21 liboffload-21-dev
 
     - name: Configure Unified Runtime project
       # ">" is used to avoid adding "\" at the end of each line; this command is quite long