Install Rust in docker image, add Rust library and build rules (#41)

* Install Rust in docker image

* Also install thumbv7em-none-eabi target

* Install Rust in docker image

* Also install thumbv7em-none-eabi target

* Add Rust example

* Link to the Rust example

* Call function from the Rust lib

* Move PROJECT_DIR to the 'paths' section

* Fix target_f1 build

* Link to the Rust library in target_f1

* Generate cbindgen bindings

* Add forgotten dependency line

* Use panic=abort instead of eh_personality lang item

* Install Rust in docker image

* Also install thumbv7em-none-eabi target

* Add Rust example

* Link to the Rust example

* Call function from the Rust lib

* Move PROJECT_DIR to the 'paths' section

* Link to the Rust library in target_f1

* Generate cbindgen bindings

* Add forgotten dependency line

* Use panic=abort instead of eh_personality lang item

* add rust call test

Co-authored-by: aanper <mail@s3f.ru>

core-rs/src/lib.rs

@@ -0,0 +1,16 @@
+#![no_std]
+
+#[no_mangle]
+pub extern "C" fn add(a: u32, b: u32) -> u32 {
+    a + b
+}
+
+
+mod aux {
+    use core::panic::PanicInfo;
+
+    #[panic_handler]
+    fn panic(_info: &PanicInfo) -> ! {
+        loop { continue }
+    }
+}