Add support for AWS Elastic Container Registry (ECR)

Add example for Google Container Registry (GCR)

src/ecr.ts

@@ -0,0 +1,7 @@
+export const isECR = async (registry: string): Promise<boolean> => {
+  return registry.includes('amazonaws');
+};
+
+export const getRegion = async (registry: string): Promise<string> => {
+  return registry.substring(registry.indexOf('ecr.') + 4, registry.indexOf('.amazonaws'));
+};