Merge #75437: kramdown-rfc2629: init at 1.2.13

I left it open much longer than planned.  Re-tested it creates html.

pkgs/tools/text/kramdown-rfc2629/Gemfile

@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'kramdown-rfc2629'

pkgs/tools/text/kramdown-rfc2629/Gemfile.lock

@@ -0,0 +1,17 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    certified (1.0.0)
+    kramdown (1.17.0)
+    kramdown-rfc2629 (1.2.13)
+      certified (~> 1.0)
+      kramdown (~> 1.17.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  kramdown-rfc2629
+
+BUNDLED WITH
+   1.17.3

pkgs/tools/text/kramdown-rfc2629/default.nix

@@ -0,0 +1,18 @@
+{ lib, bundlerApp }:
+
+# Not in the default ../../../development/ruby-modules/with-packages/Gemfile
+# because of version clash on the "kramdown" dependency.
+bundlerApp rec {
+  pname = "kramdown-rfc2629";
+  gemdir = ./.;
+  exes = [ "kramdown-rfc2629" ];
+
+  meta = with lib; {
+    description = "A markdown parser with multiple backends";
+    homepage    = "https://github.com/cabo/kramdown-rfc2629";
+    license     = with licenses; mit;
+    maintainers = with maintainers; [
+      vcunat # not really, but I expect to use it occasionally around IETF
+    ];
+  };
+}

pkgs/tools/text/kramdown-rfc2629/gemset.nix

@@ -0,0 +1,33 @@
+{
+  certified = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1706p6p0a8adyvd943af2a3093xakvislgffw3v9dvp7j07dyk5a";
+      type = "gem";
+    };
+    version = "1.0.0";
+  };
+  kramdown = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1n1c4jmrh5ig8iv1rw81s4mw4xsp4v97hvf8zkigv4hn5h542qjq";
+      type = "gem";
+    };
+    version = "1.17.0";
+  };
+  kramdown-rfc2629 = {
+    dependencies = ["certified" "kramdown"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0s53m46qlcdakik0czvx0p41mk46l9l36331cps8gpf364wf3l9d";
+      type = "gem";
+    };
+    version = "1.2.13";
+  };
+}

pkgs/top-level/all-packages.nix

@@ -1888,6 +1888,8 @@ in
 
   klaus = with python3Packages; toPythonApplication klaus;
 
+  kramdown-rfc2629 = callPackage ../tools/text/kramdown-rfc2629 { };
+
   lcdproc = callPackage ../servers/monitoring/lcdproc { };
 
   languagetool = callPackage ../tools/text/languagetool {  };