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/mod.rs

@@ -1,11 +1,29 @@
 #[cfg(feature = "web")]
 mod web;
 
+#[cfg(any(feature = "desktop", feature = "mobile"))]
+mod connect;
+#[cfg(any(feature = "desktop", feature = "mobile"))]
+mod native_audio;
+
 #[cfg(feature = "desktop")]
 mod desktop;
-
-#[cfg(all(feature = "web", not(feature = "desktop")))]
-pub use web::*;
+#[cfg(feature = "mobile")]
+mod mobile;
 
 #[cfg(feature = "desktop")]
 pub use desktop::*;
+#[cfg(feature = "mobile")]
+pub use mobile::*;
+
+#[cfg(feature = "mobile")]
+pub use mobile::request_permissions;
+
+#[cfg(any(feature = "desktop", feature = "web"))]
+pub fn request_permissions() {}
+
+#[cfg(all(feature = "web", not(any(feature = "desktop", feature = "mobile"))))]
+pub use web::*;
+
+#[cfg(any(feature = "desktop"))]
+pub use desktop::*;