update CI

Author: nurmohammed840

.github/workflows/ci.yml

@@ -12,10 +12,18 @@ env:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        toolchain:
+          - stable
+          - nightly
 
     steps:
     - uses: actions/checkout@v4
 
+    - name: Install Rust
+    - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
+
     - name: Install cargo-nextest
       uses: taiki-e/install-action@v2
       with: