pass-secret-service: various improvements

Allow setting the application package and storePath used by the
config. Since the `programs.password-store` Home Manager module sets
config values via global environment variables, the default behavior
of the module should continue to behave as before for the user.

Additionally,

- Adds a few tests.

- Use "escapeShellArg" function call to the path parameter call to
  ensure paths with spaces work.

- Allow not setting storePath, which will cause `pass_secret_service`
  to default to using `~/.password-store`.

- If `pass-secret-service` is enabled, set its store path to default
  to the one defined in our password-store environment settings.

- Add myself (houstdav000) as maintainer.

tests/modules/services/pass-secret-service/basic-configuration.nix

@@ -0,0 +1,17 @@
+{ config, pkgs, ... }:
+
+{
+  services.pass-secret-service = {
+    enable = true;
+    package = config.lib.test.mkStubPackage { };
+    storePath = "/mnt/password-store";
+  };
+
+  nmt.script = ''
+    serviceFile=home-files/.config/systemd/user/pass-secret-service.service
+
+    assertFileExists $serviceFile
+    assertFileRegex $serviceFile 'ExecStart=.*/bin/pass_secret_service'
+    assertFileRegex $serviceFile '/mnt/password-store'
+  '';
+}

tests/modules/services/pass-secret-service/default-configuration.nix

@@ -0,0 +1,15 @@
+{ config, pkgs, ... }:
+
+{
+  services.pass-secret-service = {
+    enable = true;
+    package = config.lib.test.mkStubPackage { };
+  };
+
+  nmt.script = ''
+    serviceFile=home-files/.config/systemd/user/pass-secret-service.service
+
+    assertFileExists $serviceFile
+    assertFileRegex $serviceFile 'ExecStart=.*/bin/pass_secret_service'
+  '';
+}

tests/modules/services/pass-secret-service/default.nix

@@ -0,0 +1,4 @@
+{
+  pass-secret-service-default-configuration = ./default-configuration.nix;
+  pass-secret-service-basic-configuration = ./basic-configuration.nix;
+}