add codespell action (#18818)

Original work here, #18474,  refixed and updated.

cmd/erasure-decode_test.go

@@ -144,7 +144,7 @@ func TestErasureDecode(t *testing.T) {
 		}
 		if err == nil {
 			if content := writer.Bytes(); !bytes.Equal(content, data[test.offset:test.offset+test.length]) {
-				t.Errorf("Test %d: read retruns wrong file content.", i)
+				t.Errorf("Test %d: read returns wrong file content.", i)
 			}
 		}