ci: Install libpolly-*-dev package

Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>

Author: vadorovsky

.github/workflows/build-test.yml

@@ -73,7 +73,7 @@ jobs:
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
           echo -e "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-${{ matrix.llvm }} main\n" | sudo tee /etc/apt/sources.list.d/llvm.list
           sudo apt-get update
-          sudo apt-get install llvm-${{ matrix.llvm }}-dev libclang-${{ matrix.llvm }}-dev
+          sudo apt-get install llvm-${{ matrix.llvm }}-dev libclang-${{ matrix.llvm }}-dev libpolly-${{ matrix.llvm }}-dev
 
       - name: Install LLVM tools
         if: matrix.llvm == 'rustc'