ci: build with clang-11 as well

The LLVM nightly repositories now have a separate branch for clang-11,
so let's build with it as well.

diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index f73a141420c4bfb6214b2602966ad24e6236e0d0..c9aec779c8b5608de73e94b1ace1893ce7a443ea 100644 (file)
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -20,6 +20,7 @@ jobs:
         env:
           - { COMPILER: "gcc",   COMPILER_VERSION: "10" }
           - { COMPILER: "clang", COMPILER_VERSION: "10" }
+          - { COMPILER: "clang", COMPILER_VERSION: "11" }
     env: ${{ matrix.env }}
     steps:
       - name: Repository checkout