Whole Shrimp Potstickers

Name: Whole Shrimp Potstickers
Ingredients: 2.5 cups all-purpose flour, or more as needed; 0.75 teaspoon kosher salt; 1 cup hot water; 12 large shrimp, peeled and deveined; 3 tablespoons finely sliced green onions; 2 cloves minced garlic; 2 teaspoons soy sauce; 0.5 teaspoon sesame oil; 0.5 teaspoon Sriracha sauce; 0.5 cup seasoned rice vinegar; 2 teaspoons sambal chile sauce; 2 tablespoons finely sliced green onions; 4 teaspoons vegetable oil, divided; 4 teaspoons unsalted butter, divided