Check desktop file via desktop-file-validate

Signed-off-by: Igor Raits <ignatenkobrain@fedoraproject.org>

fish.spec

@@ -47,6 +47,7 @@ BuildRequires:  pcre2-devel
 BuildRequires:  gnupg2
 BuildRequires:  python3-devel
 %global __python %{__python3}
+BuildRequires:  /usr/bin/desktop-file-validate
 
 # tab completion wants man-db
 Recommends:     man-db
@@ -101,6 +102,7 @@ cp -a CONTRIBUTING.rst %{buildroot}%{_pkgdocdir}
 
 %check
 %{_vpath_builddir}/fish_tests
+desktop-file-validate %{buildroot}%{_datadir}/applications/fish.desktop
 
 %post
 if [ "$1" = 1 ]; then