debug upb build failure on mac

Author: duncanpo

.github/workflows/mac_upb_debug.yml

@@ -36,3 +36,13 @@ jobs:
               uses: matlab-actions/run-tests@v2
               with:
                  select-by-folder: opentelemetry-matlab/test
+            - name: Compress test results into single artifact
+              if: always()
+              working-directory: ${{ github.workspace }}
+              run: tar -czf upb_failure_logs.tar.gz /Users/runner/work/OpenTelemetry-MATLAB/OpenTelemetry-MATLAB/opentelemetry-matlab/build/_deps/vcpkg-src/buildtrees/upb/
+            - name: Upload artifacts
+              if: always()
+              uses: actions/upload-artifact@v4
+              with: 
+                name: upb_failure_logs.tar.gz
+                path: ${{ github.workspace }}/upb_failure_logs.tar.gz