android builds (#9)

This adds android builds to the CI infrastructure. These builds generate an `apk` file that you can download and install.
- Adds a new container build job that builds a container with all the required android dependencies
- Adds a new release build that builds an android apk
- Updated the imp module to split out mobile and desktop behavior
- Adds logic to request microphone permissions
- Added a custom android manifest that declares the required permissions

Reviewed-on: #9

gui/src/imp/mobile.rs

@@ -0,0 +1,67 @@
+use android_permissions::{PermissionManager, RECORD_AUDIO};
+use jni::{objects::JObject, JavaVM};
+use mumble_web2_common::ClientConfig;
+
+use std::collections::HashMap;
+pub use tokio::runtime::Handle as SpawnHandle;
+pub use tokio::task::spawn;
+pub use tokio::time::sleep;
+
+pub use super::connect::*;
+pub use super::native_audio::*;
+
+pub fn set_default_username(username: &str) -> Option<()> {
+    None
+}
+
+pub fn set_default_server(server: &str) -> Option<()> {
+    None
+}
+
+pub fn load_username() -> Option<String> {
+    None
+}
+
+pub fn load_server_url() -> Option<String> {
+    None
+}
+
+pub async fn load_config() -> color_eyre::Result<ClientConfig> {
+    Ok(ClientConfig {
+        proxy_url: None,
+        cert_hash: None,
+        any_server: true,
+    })
+}
+
+pub fn init_logging() {
+    use tracing::level_filters::LevelFilter;
+    use tracing_subscriber::filter::EnvFilter;
+
+    let env_filter = EnvFilter::builder()
+        .with_default_directive(LevelFilter::INFO.into())
+        .from_env_lossy();
+
+    tracing_subscriber::fmt()
+        .with_target(true)
+        .with_level(true)
+        .with_env_filter(env_filter)
+        .init();
+}
+
+#[cfg(feature = "mobile")]
+pub fn request_permissions() {
+    request_recording_permission();
+}
+
+#[cfg(target_os = "android")]
+pub fn request_recording_permission() {
+    let ctx = ndk_context::android_context();
+    let vm = unsafe { JavaVM::from_raw(ctx.vm().cast()).unwrap() };
+    let activity = unsafe { JObject::from_raw(ctx.context().cast()) };
+
+    let manager = PermissionManager::create(vm, activity).unwrap();
+    if !manager.check(&RECORD_AUDIO).unwrap() {
+        manager.request(&[&RECORD_AUDIO]).unwrap();
+    }
+}