attempt to cache system dependencies

.github/workflows/build-linux.yml

@@ -30,17 +30,16 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Install system dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y build-essential ccache python3 python3-pip ninja-build libsdl2-dev libgl-dev libglu1-mesa-dev libpthread-stubs0-dev libglm-dev
-          python -m pip install meson
-          # Set a reasonable ccache size
-          ccache -M 5G || true
+        uses: awalsh128/cache-apt-pkgs-action@latest
+        with:
+          packages: build-essential ccache python3 python3-pip ninja-build libsdl2-dev libgl-dev libglu1-mesa-dev libpthread-stubs0-dev libglm-dev
+          version: 1.0
 
       - name: Install LLVM + libc++
         run: |
           wget -qO- https://apt.llvm.org/llvm.sh | sudo bash -s -- 20
           sudo apt-get install -y libc++-20-dev libc++abi-20-dev
+          ccache -M 5G || true # Set a reasonable ccache size
 
       - name: Restore ccache
         uses: actions/cache@v5
@@ -50,6 +49,11 @@ jobs:
           restore-keys: ${{ runner.os }}-ccache-
 
       - name: Configure Meson
+        env:
+          CC: "ccache clang"
+          CXX: "ccache clang++"
+          CC_LD: lld
+          CXX_LD: lld
         run: |
           meson setup build --native-file=scripts/llvm_native.txt -Dunity=off --wipe
           meson setup build_unity --native-file=scripts/llvm_native.txt -Dunity=on -Dunity_size=99999 --wipe