Add signature verification

OBS-URL: https://build.opensuse.org/package/show/KDE:Frameworks5/libksysguard5?expand=0&rev=183

libksysguard-5.13.90.tar.xz.sig

@@ -0,0 +1,11 @@
+-----BEGIN PGP SIGNATURE-----
+
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+DApuIEEgxBTX//fhjgKTpFbWh3yuAw==
+=01Wo
+-----END PGP SIGNATURE-----

libksysguard5.changes

@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sat Sep 15 16:25:29 UTC 2018 - fabian@ritter-vogt.de
+
+- Add tarball signature and keyring containing keys of release managers
+  Jonathan Riddell and Bhushan Shah
+
 -------------------------------------------------------------------
 Thu Sep 13 17:25:02 UTC 2018 - fabian@ritter-vogt.de
 

libksysguard5.spec

@@ -25,7 +25,11 @@ License:        GPL-2.0-or-later
 Group:          Development/Libraries/C and C++
 Url:            http://www.kde.org
 Source:         http://download.kde.org/unstable/plasma/%{version}/libksysguard-%{version}.tar.xz
-Source1:        baselibs.conf
+%if %{with lang}
+Source1:        http://download.kde.org/unstable/plasma/%{version}/libksysguard-%{version}.tar.xz.sig
+Source2:        plasma.keyring
+%endif
+Source3:        baselibs.conf
 BuildRequires:  extra-cmake-modules >= 1.2.0
 BuildRequires:  kf5-filesystem
 BuildRequires:  xz