workflow: remove check job

`cargo clippy` actually runs `cargo check` too.

.github/workflows/rust.yml

@@ -11,32 +11,6 @@ on:
 name: Rust
 
 jobs:
-  check:
-    name: Check
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout sources
-        uses: actions/checkout@v2
-
-      - name: Restore cache
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-            target
-          key: ${{ runner.os }}-cargo-check-${{ hashFiles('**/Cargo.lock') }}
-
-      - name: Install toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-
-      - name: Run cargo check
-        uses: actions-rs/cargo@v1
-        with:
-          command: check
-
   test:
     name: Test Suite
     runs-on: ubuntu-latest