doppler: add version test & shell completion

pkgs/tools/security/doppler/default.nix

@@ -1,4 +1,10 @@
-{ buildGoModule, fetchFromGitHub, lib }:
+{ buildGoModule
+, doppler
+, fetchFromGitHub
+, installShellFiles
+, lib
+, testers
+}:
 
 buildGoModule rec {
   pname = "doppler";
@@ -13,15 +19,29 @@ buildGoModule rec {
 
   vendorSha256 = "sha256-evG1M0ZHfn9hsMsSncwxF5Hr/VJ7y6Ir0D2gHJaunBo=";
 
-  ldflags = [ "-X github.com/DopplerHQ/cli/pkg/version.ProgramVersion=v${version}" ];
+  ldflags = [
+    "-s -w"
+    "-X github.com/DopplerHQ/cli/pkg/version.ProgramVersion=v${version}"
+  ];
+
+  nativeBuildInputs = [ installShellFiles ];
 
   postInstall = ''
     mv $out/bin/cli $out/bin/doppler
+    installShellCompletion --cmd doppler \
+      --bash <($out/bin/doppler completion bash) \
+      --fish <($out/bin/doppler completion fish) \
+      --zsh <($out/bin/doppler completion zsh)
   '';
 
+  passthru.tests.version = testers.testVersion {
+    package = doppler;
+    version = "v${version}";
+  };
+
   meta = with lib; {
-    homepage = "https://doppler.com";
     description = "The official CLI for interacting with your Doppler Enclave secrets and configuration";
+    homepage = "https://doppler.com";
     license = licenses.asl20;
     maintainers = with maintainers; [ lucperkins ];
   };