Improve packaging (#328)

* Add gpgui-helper (#326)

* Add packaging

crates/gpapi/src/process/gui_helper_launcher.rs

@@ -0,0 +1,68 @@
+use std::{collections::HashMap, path::PathBuf, process::Stdio};
+
+use anyhow::bail;
+use log::info;
+use tokio::{io::AsyncWriteExt, process::Command};
+
+use crate::{process::command_traits::CommandExt, utils, GP_GUI_HELPER_BINARY};
+
+pub struct GuiHelperLauncher<'a> {
+  program: PathBuf,
+  envs: Option<&'a HashMap<String, String>>,
+  api_key: &'a [u8],
+  gui_version: Option<&'a str>,
+}
+
+impl<'a> GuiHelperLauncher<'a> {
+  pub fn new(api_key: &'a [u8]) -> Self {
+    Self {
+      program: GP_GUI_HELPER_BINARY.into(),
+      envs: None,
+      api_key,
+      gui_version: None,
+    }
+  }
+
+  pub fn envs(mut self, envs: Option<&'a HashMap<String, String>>) -> Self {
+    self.envs = envs;
+    self
+  }
+
+  pub fn gui_version(mut self, version: Option<&'a str>) -> Self {
+    self.gui_version = version;
+    self
+  }
+
+  pub async fn launch(&self) -> anyhow::Result<()> {
+    let mut cmd = Command::new(&self.program);
+
+    if let Some(envs) = self.envs {
+      cmd.env_clear();
+      cmd.envs(envs);
+    }
+
+    cmd.arg("--api-key-on-stdin");
+
+    if let Some(gui_version) = self.gui_version {
+      cmd.arg("--gui-version").arg(gui_version);
+    }
+
+    info!("Launching gpgui-helper");
+    let mut non_root_cmd = cmd.into_non_root()?;
+    let mut child = non_root_cmd.kill_on_drop(true).stdin(Stdio::piped()).spawn()?;
+    let Some(mut stdin) = child.stdin.take() else {
+      bail!("Failed to open stdin");
+    };
+
+    let api_key = utils::base64::encode(self.api_key);
+    tokio::spawn(async move {
+      stdin.write_all(api_key.as_bytes()).await.unwrap();
+      drop(stdin);
+    });
+
+    let exit_status = child.wait().await?;
+    info!("gpgui-helper exited with: {}", exit_status);
+
+    Ok(())
+  }
+}