Java: Add Model Difference workflow on model generator changes.

Author: michaelnebel

.github/workflows/mad_modelDiff.yml

@@ -11,7 +11,7 @@ on:
     branches:
       - main
     paths:
-      # - "java/ql/src/utils/model-generator/**/*.*"
+      - "java/ql/src/utils/model-generator/**/*.*"
       - ".github/workflows/mad_modelDiff.yml"
 
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