Sichuan style Zucchini stir fry

2 zucchini
1 tbsp. salt
1/2 tbsp. doubanjiang
1 tbsp. cooking oil
50 g pork belly slices
2 garlic cloves , chopped
1 thumb ginger , chopped
3 scallion , cut into sections
4 fresh chili pepper , cut into circles
1 tbsp. oyster sauce
1/2 tsp. sugar