Don't test the OUTPOSTS storage class

This test will only work on an s3 bucket on an s3 outpost. Most
developers won't have access to one of these.

Signed-off-by: James Hewitt <james.hewitt@uk.ibm.com>

registry/storage/driver/s3-aws/s3_test.go

@@ -213,6 +213,11 @@ func TestStorageClass(t *testing.T) {
 			t.Fatalf("unexpected error creating driver with storage class %v: %v", storageClass, err)
 		}
 
+		// Can only test outposts if using s3 outposts
+		if storageClass == s3.StorageClassOutposts {
+			continue
+		}
+
 		err = s3Driver.PutContent(ctx, filename, contents)
 		if err != nil {
 			t.Fatalf("unexpected error creating content with storage class %v: %v", storageClass, err)