Or ubuntu 20.04

Author: rileysdev

check-code-style/action.yml

@@ -12,7 +12,7 @@ runs:
   using: "composite"
   steps:
     - name: Install code checking tools if on Ubuntu
-      if: inputs.os == 'ubuntu-latest'
+      if: inputs.os == 'ubuntu-latest' || inputs.os == 'ubuntu-20.04'
       run: |
         # Install Clang (including clang-format) through LLVM's preferred mechanism:
         #   https://apt.llvm.org/