Update dotnet-tests.yml

Author: crpietschmann

.github/workflows/dotnet-tests.yml

@@ -84,7 +84,7 @@ jobs:
           EMPTY=$(( BAR_LENGTH - FILLED ))
 
           BAR=""
-          for ((i=0; i<FILLED; i++)); do BAR+=CHAR; done
+          for ((i=0; i<FILLED; i++)); do BAR+=$CHAR; done
           for ((i=0; i<EMPTY; i++)); do BAR+="⬜"; done
           echo "$BAR"
         }