Fix bad gerp match

.github/workflows/forui_build.yaml

@@ -30,7 +30,7 @@ jobs:
       - run: flutter pub run build_runner build --delete-conflicting-outputs
       - run: |
           output=$(dart doc --validate-links .)
-          if echo "$output" | grep -qv "Found 0 warnings and 0 errors"; then
+          if echo "$output" | grep -q "Found 0 warnings and 0 errors"; then
             exit 1
           fi
       - run: flutter analyze