tosa-tools: make oobt-results upload non-fatal

upload-artifact crashes on the oobt-results tree (thousands of small
files, ~126MB): a Node.js buffer bug in the pinned action, not a test
failure. The actual out-of-box test suite passes; this artifact is
diagnostic-only and nothing downstream consumes it, so don't fail the
job over the upload.

Author: luhenry

.github/workflows/build-tosa-tools.yml

@@ -196,8 +196,12 @@ jobs:
             --platform-label linux-riscv64 \
             --output-dir oobt-results
 
+      # oobt-results has thousands of small files, which upload-artifact can crash on
+      # (source.copy is not a function); this artifact is diagnostic-only and nothing
+      # downstream depends on it, so don't fail the job over it.
       - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
         if: always()
+        continue-on-error: true
         with:
           name: tosa-tools-${{ env.TOSA_TOOLS_VERSION }}-${{ matrix.python }}-oobt-results
           path: oobt-results