build: run test against Rust nightly

.forgejo/workflows/push-next.yml

@@ -13,6 +13,12 @@ jobs:
   build:
     runs-on: docker
 
+    strategy:
+      matrix:
+        toolchain:
+          - name: stable
+          - name: nightly
+
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -20,7 +26,7 @@ jobs:
       - name: Format
         uses: https://git.kemitix.net/kemitix/rust@v2.0.4
         with:
-          args: cargo fmt --all -- --check
+          args: ${{ matrix.toolchain.name }} cargo fmt --all -- --check
 
       # - name: Machete
       #   uses: https://github.com/bnjbvr/cargo-machete@v0.6.2
@@ -28,17 +34,17 @@ jobs:
       - name: Clippy
         uses: https://git.kemitix.net/kemitix/rust@v2.0.4
         with:
-          args: cargo clippy
+          args: ${{ matrix.toolchain.name }} cargo clippy
 
       - name: Build
         uses: https://git.kemitix.net/kemitix/rust@v2.0.4
         with:
-          args: cargo build
+          args: ${{ matrix.toolchain.name }} cargo build
 
       - name: Test
         uses: https://git.kemitix.net/kemitix/rust@v2.0.4
         with:
-          args: cargo test --no-fail-fast
+          args: ${{ matrix.toolchain.name }} cargo test --no-fail-fast
 
       - name: Integration
         uses: https://git.kemitix.net/kemitix/rust@v2.0.4