github/workflows: run CodeQL job on Arch Linux

Hopefully this will fix the unrecognized compiler flag issues.

.github/workflows/lone.yml

@@ -73,16 +73,25 @@ jobs:
   analyze:
     name: CodeQL analysis
     runs-on: ubuntu-latest
+    container: archlinux:base-devel
+
     permissions:
       actions: read
       contents: read
       security-events: write
+
     strategy:
       fail-fast: false
       matrix:
         language: [ 'cpp' ]
 
     steps:
+    - name: Set up pacman keys
+      run: pacman-key --init
+
+    - name: Update packages and install dependencies
+      run: pacman -Syu --noconfirm clang lld llvm mold
+
     - name: Checkout lone repository
       uses: actions/checkout@v4