Changelog meta entry (#60371)

meta.changelog: enable, document, add for GNU Hello

doc/meta.xml

@@ -150,6 +150,19 @@ hello-2.3  A program that produces a familiar, friendly greeting
      </para>
     </listitem>
    </varlistentry>
+   <varlistentry>
+    <term>
+     <varname>changelog</varname>
+    </term>
+    <listitem>
+     <para>
+      A link or a list of links to the location of Changelog for a package.
+     A link may use expansion to refer to the correct changelog version.
+             Example:
+      <literal>"https://git.savannah.gnu.org/cgit/hello.git/plain/NEWS?h=v${version}"</literal>
+     </para>
+    </listitem>
+   </varlistentry>
    <varlistentry>
     <term>
      <varname>license</varname>

pkgs/applications/misc/hello/default.nix

@@ -18,6 +18,7 @@ stdenv.mkDerivation rec {
       It is fully customizable.
     '';
     homepage = https://www.gnu.org/software/hello/manual/;
+    changelog = "https://git.savannah.gnu.org/cgit/hello.git/plain/NEWS?h=v${version}";
     license = licenses.gpl3Plus;
     maintainers = [ maintainers.eelco ];
     platforms = platforms.all;

pkgs/stdenv/generic/check-meta.nix

@@ -165,6 +165,7 @@ let
     branch = str;
     homepage = either (listOf str) str;
     downloadPage = str;
+    changelog = either (listOf str) str;
     license = either (listOf lib.types.attrs) (either lib.types.attrs str);
     maintainers = listOf (attrsOf str);
     priority = int;