dysk: install man page and shell completions

pkgs/tools/filesystems/dysk/default.nix

@@ -1,6 +1,7 @@
 { lib
 , rustPlatform
 , fetchFromGitHub
+, installShellFiles
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -16,6 +17,15 @@ rustPlatform.buildRustPackage rec {
 
   cargoHash = "sha256-YmA1Qx3oKHXlXs3FWoLMRAnFdIQaFdLJaNwj/FxIS5Q=";
 
+  nativeBuildInputs = [
+    installShellFiles
+  ];
+
+  postInstall = ''
+    installManPage $releaseDir/build/*/out/dysk.1
+    installShellCompletion $releaseDir/build/*/out/{dysk.bash,dysk.fish,_dysk}
+  '';
+
   meta = with lib; {
     description = "Get information on your mounted disks";
     homepage = "https://github.com/Canop/dysk";