GHA: Exclude 32-bit core.thread-shared unittests for Linux multilib job; newly hangs rather frequently on Ubuntu 22

Author: kinke

.github/actions/4d-test-libs/action.yml

@@ -19,7 +19,10 @@ runs:
         fi
 
         excludes="dmd-testsuite|lit-tests|ldc2-unittest"
-        if [[ '${{ runner.os }}-${{ inputs.arch }}' == Linux-aarch64 ]]; then
+        if [[ '${{ runner.os }}-${{ inputs.arch }}' == Linux-x86_64 ]]; then
+          # sporadically hanging since Ubuntu 22
+          excludes+='|^core.thread-shared_32$'
+        elif [[ '${{ runner.os }}-${{ inputs.arch }}' == Linux-aarch64 ]]; then
           # FIXME: failing unittest(s)
           excludes+='|^std.internal.math.gammafunction'
           # FIXME: failing unittest(s) with enabled optimizations