!7 Add buildRequires systemd

From: @caodongxia 
Reviewed-by: @jxy_git 
Signed-off-by: @jxy_git

pushgateway.spec

@@ -8,7 +8,7 @@
 
 Name:    pushgateway
 Version: 1.4.1
-Release: 2
+Release: 3
 Summary: Prometheus pushgateway.
 License: ASL 2.0
 URL:     https://github.com/prometheus/%{name}
@@ -21,6 +21,7 @@ Patch1:  0001-Log-shutdown-gracefully-428.patch
 
 BuildRequires:  golang >= 1.13
 BuildRequires:  promu
+BuildRequires:  systemd
 %{?systemd_requires}
 Requires(pre): shadow-utils
 
@@ -69,6 +70,9 @@ exit 0
 %dir %attr(755, prometheus, prometheus)%{_sharedstatedir}/prometheus
 
 %changelog
+* Thu Jan 5 2023 caodongxia <caodongxia@h-partners.com> - 1.4.1-3
+- Add buildRequires systemd
+
 * Mon Oct 11 2021 chenchen <chen_aka_jan@163.com> - 1.4.1-2
 - Logr shutdownr gracefully(#428