Mark broken test on CI as such

Author: giordano

test/runners.jl

@@ -443,7 +443,9 @@ end
             set -e
             make -j${nproc} -sC /usr/share/testsuite install
             """
-            @test run(ur, `/bin/bash -c "$(test_script)"`, iobuff; tee_stream=devnull)
+            # This test fails on GitHub Actions:
+            # <https://github.com/JuliaPackaging/BinaryBuilderBase.jl/issues/347>.
+            @test run(ur, `/bin/bash -c "$(test_script)"`, iobuff) broken=get(ENV, "GITHUB_ACTIONS", "false")=="true"
         end
     end
 end