ci: run build test with clang-12 as well

Ubuntu repositories for clang 12 are finally up, so let's use it
in our CI.

diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index e4472511c2c74ce0bfa169743a04c2f7713ec50c..dc136a5aa99f3828c9089390a763fe11b6410f46 100644 (file)
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -21,6 +21,7 @@ jobs:
           - { COMPILER: "gcc",   COMPILER_VERSION: "10" }
           - { COMPILER: "clang", COMPILER_VERSION: "10" }
           - { COMPILER: "clang", COMPILER_VERSION: "11" }
+          - { COMPILER: "clang", COMPILER_VERSION: "12" }
     env: ${{ matrix.env }}
     steps:
       - name: Repository checkout