ci: Check rustfmt/clippy on all platforms

.github/workflows/tests.yml

@@ -109,6 +109,10 @@ jobs:
         run: cargo build --all-targets
       - name: Test
         run: cargo test --workspace
+      - name: Check rustfmt
+        run: cargo fmt --all --check
+      - name: Check clippy
+        run: cargo clippy --all-targets --all-features -- -D warnings
 
   minimal-versions:
     needs: [quick-test]