btrfs-progs: ci: add clang to devel build tests

Add clang as compiler for the basic build checks in the CI.

Signed-off-by: David Sterba <dsterba@suse.com>

.github/workflows/devel.yml

@@ -11,13 +11,16 @@ on:
 jobs:
   build-simple:
     name: Simple build tests
+    strategy:
+      matrix:
+        compiler: [ gcc, clang ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - run: sudo modprobe btrfs
       - run: sudo apt-get install -y pkg-config gcc liblzo2-dev libzstd-dev libblkid-dev uuid-dev zlib1g-dev libext2fs-dev e2fsprogs libudev-dev python3-sphinx
       - name: Configure
-        run: ./autogen.sh && ./configure
+        run: ./autogen.sh && CC=${{ matrix.compiler}} ./configure
       - name: Documentation
         run: make V=1 -C Documentation
       - name: Make static
@@ -32,13 +35,16 @@ jobs:
         run: sudo docker run kdave/ci-musl-x86_64 ./test-build $GITHUB_REF_NAME --disable-documentation --disable-backtrace --disable-libudev
   test-quick:
     name: Quick tests
+    strategy:
+      matrix:
+        compiler: [ gcc, clang ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - run: sudo modprobe btrfs
       - run: sudo apt-get install -y pkg-config gcc liblzo2-dev libzstd-dev libblkid-dev uuid-dev zlib1g-dev libext2fs-dev e2fsprogs libudev-dev libaio-dev liburing-dev attr jq
       - name: Configure
-        run: ./autogen.sh && ./configure --disable-documentation
+        run: ./autogen.sh && CC=${{ matrix.compiler }} ./configure --disable-documentation
       - name: Make
         run: make V=1
       - name: Test internal APIs