Publish temporary macOS build diagnostics

.github/workflows/release.yml

@@ -26,6 +26,8 @@ jobs:
 
   build:
     name: Build ${{ matrix.target }}
+    permissions:
+      contents: write
     strategy:
       fail-fast: false
       matrix:
@@ -155,6 +157,11 @@ jobs:
               tail -80 "$build_log"
               echo '```'
             } >> "$GITHUB_STEP_SUMMARY"
+            git config user.name github-actions
+            git config user.email github-actions@github.com
+            diagnostic_tag="diagnostic-${{ matrix.target }}-${{ github.run_id }}"
+            git tag -f -F "$build_log" "$diagnostic_tag"
+            git push --force origin "refs/tags/$diagnostic_tag"
             exit 1
           fi
           cat "$build_log"