Small change in README.md.

Author: paulusalliander

.github/workflows/README.md

@@ -1,4 +1,7 @@
 # GXF github workflows
-## Run build.yml for testing
+## build.yml
+Responsible for building docker containers as artifacts and running cucumber tests.
+
+### Run build.yml for testing
 To run build.yml for testing you need to add a label to your PR containing the text cucumber_testing. You can add a label by opening your PR in the github interface and clicking labels in the right side bar according to https://docs.github.com/en/issues/using-labels-and-milestones-to-track-work/managing-labels.
 Afterwards you can remove the label again.