FakeTar: /var/log/postgres can't be both a folder and a file

fake/fake.go

@@ -14,7 +14,7 @@ func FakeTar() (io.Reader, error) {
 	content := []byte("Hello world!\n")
 	buf := new(bytes.Buffer)
 	tw := tar.NewWriter(buf)
-	for _, name := range []string {"/etc/postgres/postgres.conf", "/etc/passwd", "/var/log/postgres", "/var/log/postgres/postgres.conf"} {
+	for _, name := range []string {"/etc/postgres/postgres.conf", "/etc/passwd", "/var/log/postgres/postgres.conf"} {
 		hdr := new(tar.Header)
 		hdr.Size = int64(len(content))
 		hdr.Name = name