chore(ci): add rust cache to check-docs-patched

Author: dnbln

.github/workflows/check-docs-patched.yml

@@ -30,6 +30,8 @@ jobs:
           run: rustup install nightly && rustup default nightly && rustup component add rust-analyzer
         - name: Install dependencies
           run: sudo apt update && sudo apt install openssl libssl-dev
+        - name: Rust cache
+          uses: Swatinem/rust-cache@v2
         - name: Build nexus
           run: cargo build -p nexus
         - name: Check if documentation is patched