ci: Also run clippy, and build docs with warnings

Author: MarijnS95

.github/workflows/ci.yml

@@ -34,11 +34,14 @@ jobs:
         with:
           toolchain: ${{ matrix.toolchain }}
           target: ${{ matrix.target }}
-          components: rustfmt
+          components: rustfmt, clippy
 
       - run: cargo fmt --check
+      - run: cargo clippy --target=${{ matrix.target }} -- -Dwarnings
       - run: cargo build --target=${{ matrix.target }}
       - run: cargo doc --target=${{ matrix.target }}
+        env:
+          RUSTDOCFLAGS: -Dwarnings
       # Temporary test non-target only.
       # TODO: Test in emulator or something.
       - run: cargo test