github/workflows: Add CI test for documentation

Check documentation didn't break on pull requests.

Signed-off-by: Carlos Bilbao <[email protected]>

Author: Zildj1an

.github/workflows/rust.yml

@@ -54,3 +54,8 @@ jobs:
         with:
           command: clippy
           args: --all-features --tests --target=x86_64-unknown-linux-gnu -- -D warnings
+
+      - name: Check documentation
+        run: make doc
+        env:
+          RUSTDOCFLAGS: -D warnings