Build doc in CI

Author: Sh3Rm4n

.github/workflows/ci.yml

@@ -103,6 +103,23 @@ jobs:
           command: fmt
           args: --all -- --check
 
+  rustdoc:
+    name: Rust Doc
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          target: thumbv7em-none-eabihf
+          override: true
+          profile: minimal
+          components: rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: doc
+          args: --features=stm32f303xc,rt,stm32-usbd,can
+
   codegen:
     name: Check Codegen
     runs-on: ubuntu-latest