Heat the oil in a large pot over medium-high heat. Add the ginger, chili paste, fungi, bamboo shoots, and pork; cook and stir for 1 minute to infuse the flavor. Combine the soy sauce, vinegars, salt, pepper, and sugar in a small bowl, pour it into the wok and toss everything together. Pour in the chicken stock, bring the soup to a boil, and simmer for 10 minutes.