add cargo check to CI

.github/workflows/ci.yml

@@ -3,8 +3,27 @@ on: [push, pull_request]
 name: CI
 
 jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+
+      - name: Run cargo check
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+
   test:
-    name: Test Suite
+    name: Tests
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources