Formatting, linting, and hopefully a CI build.

Sources/StableDiffusionCore/ImageExtensions.swift

@@ -0,0 +1,22 @@
+import CoreImage
+import Foundation
+import UniformTypeIdentifiers
+
+extension CGImage {
+    func toPngData() throws -> Data {
+        guard let data = CFDataCreateMutable(nil, 0) else {
+            throw SdCoreError.imageEncode
+        }
+
+        guard let destination = CGImageDestinationCreateWithData(data, "public.png" as CFString, 1, nil) else {
+            throw SdCoreError.imageEncode
+        }
+
+        CGImageDestinationAddImage(destination, self, nil)
+        if CGImageDestinationFinalize(destination) {
+            return data as Data
+        } else {
+            throw SdCoreError.imageEncode
+        }
+    }
+}