Add clang tidy (#864)

Fixes #863

.github/workflows/build.yml

@@ -82,10 +82,15 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Add llvm repo
+        run: |
+          echo 'deb http://apt.llvm.org/focal/ llvm-toolchain-focal-16 main' >> /etc/apt/sources.list
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
+
       - name: Install packages
         run: |
           apt update -qq
-          apt install -y jq
+          apt install -y jq clang-tidy-16
 
       - name: Install ccache
         run: |