Android Support (#166)

1. Add vpnservice tauri plugin for android.
2. add workflow for android.
3. Easytier Core support android, allow set tun fd.

tauri-plugin-vpnservice/src/mobile.rs

@@ -0,0 +1,54 @@
+use serde::de::DeserializeOwned;
+use tauri::{
+    plugin::{PluginApi, PluginHandle},
+    AppHandle, Runtime,
+};
+
+use crate::models::*;
+
+#[cfg(target_os = "android")]
+const PLUGIN_IDENTIFIER: &str = "com.plugin.vpnservice";
+
+#[cfg(target_os = "ios")]
+tauri::ios_plugin_binding!(init_plugin_vpnservice);
+
+// initializes the Kotlin or Swift plugin classes
+pub fn init<R: Runtime, C: DeserializeOwned>(
+    _app: &AppHandle<R>,
+    api: PluginApi<R, C>,
+) -> crate::Result<Vpnservice<R>> {
+    #[cfg(target_os = "android")]
+    let handle = api.register_android_plugin(PLUGIN_IDENTIFIER, "VpnServicePlugin")?;
+    #[cfg(target_os = "ios")]
+    let handle = api.register_ios_plugin(init_plugin_vpnservice)?;
+    Ok(Vpnservice(handle))
+}
+
+/// Access to the vpnservice APIs.
+pub struct Vpnservice<R: Runtime>(PluginHandle<R>);
+
+impl<R: Runtime> Vpnservice<R> {
+    pub fn ping(&self, payload: PingRequest) -> crate::Result<PingResponse> {
+        self.0
+            .run_mobile_plugin("ping", payload)
+            .map_err(Into::into)
+    }
+
+    pub fn prepare_vpn(&self, payload: VoidRequest) -> crate::Result<Status> {
+        self.0
+            .run_mobile_plugin("prepare_vpn", payload)
+            .map_err(Into::into)
+    }
+
+    pub fn start_vpn(&self, payload: StartVpnRequest) -> crate::Result<Status> {
+        self.0
+            .run_mobile_plugin("start_vpn", payload)
+            .map_err(Into::into)
+    }
+
+    pub fn stop_vpn(&self, payload: VoidRequest) -> crate::Result<Status> {
+        self.0
+            .run_mobile_plugin("stop_vpn", payload)
+            .map_err(Into::into)
+    }
+}