📌 Test on Rust stable, beta and nightly toolchains

Test on all three release channels of Rust.

.github/workflows/ci.yml

@@ -21,11 +21,20 @@ permissions:
   contents: read
 
 jobs:
-  cargo:
+  rust:
     runs-on: ubuntu-24.04
+    strategy:
+      matrix:
+        toolchain:
+          - stable
+          - beta
+          - nightly
     steps:
     - name: Checkout repository
-      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+      uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332  # v4.1.7
+
+    - name: Update Rust toolchain
+      run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
 
     - name: Build
       run: cargo build --verbose