ci: add task for cargo-c.

This will prevent bitrot with the cargo-c support.

.github/workflows/test.yaml

@@ -218,6 +218,21 @@ jobs:
       - name: Clang tidy
         run: clang-tidy tests/*.c -- -I src/
 
+  cargo-c:
+    name: cargo-c
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+        with:
+          persist-credentials: false
+      - name: Install rust toolchain
+        uses: dtolnay/rust-toolchain@nightly
+      - name: Install cargo-c
+        run: cargo install cargo-c
+      - name: Build and test with cargo-c
+        run: cargo ctest
+
   miri:
     name: Miri
     runs-on: ubuntu-latest