Optionally remove .pub suffix from file names

keys/default.nix

@@ -1,14 +1,30 @@
 let
   inherit (builtins)
+    attrValues
     elemAt
+    foldl'
     mapAttrs
     match
     readDir
     readFile
     ;
+  ## `mergeAttrs` and `concatMapAttrs` are in `lib.trivial` and `lib.attrsets`,
+  ## but we would rather avoid a dependency in nixpkgs for this file.
+  mergeAttrs = x: y: x // y;
+  concatMapAttrs = f: v: foldl' mergeAttrs { } (attrValues (mapAttrs f v));
+  removePubSuffix =
+    s:
+    let
+      maybeMatch = match "(.*)\.pub" s;
+    in
+    if maybeMatch == null then s else elemAt maybeMatch 0;
   removeTrailingWhitespace = s: elemAt (match "(.*[^[:space:]])[[:space:]]*" s) 0;
+
   collectKeys =
-    dir: mapAttrs (name: _: removeTrailingWhitespace (readFile (dir + "/${name}"))) (readDir dir);
+    dir:
+    concatMapAttrs (name: _: {
+      "${removePubSuffix name}" = removeTrailingWhitespace (readFile (dir + "/${name}"));
+    }) (readDir dir);
 in
 {
   contributors = collectKeys ./contributors;