ci: forgot to --add-architecture

.github/workflows/c-cpp.yml

@@ -44,7 +44,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install dependencies
-        run: sudo apt-get install git gcc g++ gcc-multilib g++-multilib make libsdl2-dev zlib1g-dev libsdl2-dev:i386 zlib1g-dev:i386
+        run: |
+          sudo dpkg --add-architecture i386
+          sudo apt-get update
+          sudo apt-get install git gcc g++ gcc-multilib g++-multilib make libsdl2-dev zlib1g-dev libsdl2-dev:i386 zlib1g-dev:i386
       - name: Checkout repository
         uses: actions/checkout@v3
       - name: Build pd.exe