Maybe fix Rust action setup?

.forgejo/workflows/build.yaml

@@ -13,6 +13,7 @@ jobs:
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
         with:
+          toolchain: stable
           components: rustfmt
       - name: Check Rust formatting
         run: cargo fmt --all -- --check
@@ -26,6 +27,7 @@ jobs:
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
         with:
+          toolchain: stable
           components: clippy
       - name: Run Clippy
         run: cargo clippy -- -D warnings
@@ -38,6 +40,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
       - name: Check for Rust compilation errors
         run: cargo check
 
@@ -49,10 +53,26 @@ jobs:
         uses: actions/checkout@v4
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
-      - name: Set up Python
+        with:
+          toolchain: stable
+      - name: Set up Python toolchain
         uses: actions/setup-python@v5
         with:
           python-version: 3.13.2
+      - name: Set up Python environment
         run: pip install -r requirements.txt
       - name: Build Rust code
         run: maturin develop
+
+  test-rust:
+    name: Test Rust
+    runs-on: docker
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Rust
+        uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
+      - name: Run Rust tests
+        run: cargo test