CI: Explicitly check for board support because the test running claus…

…e would not test on its own and fail on missing feature requirements

.github/workflows/buildtest.yml

@@ -102,10 +102,9 @@ jobs:
         echo "::echo ::on"
         for D in ${DIRS}; do
           cd ${D}
+          BOARDS=$(( matrix.board }} make info-boards-supported | grep -q . || { cd -; continue }
           echo "::group::Building ${D}"
-          # By running buildtest instead of all, we just skip boards that don't
-          # satisfy some requirements for some test
-          BOARDS=${{ matrix.board }} make buildtest BUILDTEST_MAKE_REDIRECT=''
+          BOARD=${{ matrix.board }} make all
           echo "::endgroup::"
           if make test/available BOARD=native && [ "native" = "${{ matrix.board }}" ]; then
             echo "::group::Testing ${D}"