Added setup rust toolchain

.gitea/workflows/build.yaml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Set up Rust toolchain
+        uses: actions-rust-lang/setup-rust-toolchain@v1
       - name: Build
         run: cargo build --verbose
       - name: Run tests