remove hard code

Author: mattiaswal

.github/workflows/build-image.yml

@@ -147,7 +147,7 @@ jobs:
 
           # Use the standardized mkimage.sh path for the selected board
           #          BOARD_SCRIPT="src/board/${{ inputs.board }}/mkimage.sh"
-          BOARD_SCRIPT="src/board/raspberry-pi-4/mkimage.sh"
+          BOARD_SCRIPT="src/board/{{ inputs.board }}/mkimage.sh"
 
           if [ -f "$BOARD_SCRIPT" ]; then
             echo "Using board-specific image creation script: $BOARD_SCRIPT"