ci: clean up downloaded event-codes header after generation

Author: haithium

.github/workflows/generate-ecodes.yml

@@ -34,6 +34,9 @@ jobs:
       - name: Run code generation script
         run: ./scripts/generate-ecodes.lua input-event-codes.h
 
+      - name: Clean up temporary header
+        run: rm input-event-codes.h
+
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v8
         with: