Add clang-13 to CI

Fixes #1476

.github/workflows/ci.yml

@@ -221,6 +221,9 @@ jobs:
         - name: linux_clang-12_release
           os: ubuntu-latest
           env: {CXX: clang++, CC: clang,  ALPAKA_CI_CLANG_VER: 12,     ALPAKA_CI_STDLIB: libc++,    CMAKE_BUILD_TYPE: Release, ALPAKA_CI_BOOST_BRANCH: boost-1.76.0, ALPAKA_CI_CMAKE_VER: 3.21.1, OMP_NUM_THREADS: 4, ALPAKA_CI_DOCKER_BASE_IMAGE_NAME: "ubuntu:20.04", ALPAKA_ACC_CPU_B_TBB_T_SEQ_ENABLE: OFF, CMAKE_CXX_EXTENSIONS: OFF}
+        - name: linux_clang-13_debug
+          os: ubuntu-latest
+          env: {CXX: clang++, CC: clang,  ALPAKA_CI_CLANG_VER: 13,     ALPAKA_CI_STDLIB: libstdc++, CMAKE_BUILD_TYPE: Debug,   ALPAKA_CI_BOOST_BRANCH: boost-1.74.0, ALPAKA_CI_CMAKE_VER: 3.20.0, OMP_NUM_THREADS: 3, ALPAKA_CI_DOCKER_BASE_IMAGE_NAME: "ubuntu:20.04", CMAKE_CXX_EXTENSIONS: OFF}
 
         # icpc
         - name: linux_icpc_release

script/install_clang.sh

@@ -18,7 +18,7 @@ source ./script/set.sh
 : "${ALPAKA_CI_STDLIB?'ALPAKA_CI_STDLIB must be specified'}"
 : "${CXX?'CXX must be specified'}"
 
-# add clang-11 reposetory for ubuntu 18.04
+# add clang-11 repository for ubuntu 18.04
 if [[ "$(cat /etc/os-release)" == *"18.04"* && "${ALPAKA_CI_CLANG_VER}" -eq 11 ]]
 then
     travis_retry sudo DEBIAN_FRONTEND=noninteractive apt-get -y --quiet --allow-unauthenticated --no-install-recommends install tzdata
@@ -29,6 +29,13 @@ then
     travis_retry apt-get -y --quiet update
 fi
 
+# add clang-13 repository for ubuntu 20.04
+if [[ "$(cat /etc/os-release)" == *"20.04"* && "${ALPAKA_CI_CLANG_VER}" -eq 13 ]]
+then
+    wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+    sudo add-apt-repository 'deb http://apt.llvm.org/focal/ llvm-toolchain-focal-13 main'
+fi
+
 travis_retry sudo apt-get -y --quiet --allow-unauthenticated --no-install-recommends install clang-${ALPAKA_CI_CLANG_VER}
 
 if [ "${ALPAKA_CI_STDLIB}" == "libc++" ]