Forbid warnings in CI

Author: Kobzol

.github/workflows/main.yml

@@ -38,8 +38,8 @@ jobs:
 
       - uses: Swatinem/rust-cache@9d47c6ad4b02e050fd481d890b2ea34778fd09d6
 
-      - name: Build the validation tool
-        run: cargo build
+      - name: Build the team binary
+        run: RUSTFLAGS="--deny warnings" cargo build
 
       - name: Validate the repository contents
         run: cargo run -- check --strict