ci: build latest docs.rs environment to defend against failed deployments (#1485)

ci: build latest docs.rs environment to defend against faild deployments

Author: ok-nick

.github/workflows/release_readiness.yml

@@ -176,27 +176,10 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: nightly-2025-06-05
-          # Nightly is used here because the docs.rs build
-          # uses nightly and we use doc_cfg features that are
-          # not in stable Rust as of this writing (Rust 1.87).
+        uses: dtolnay/rust-toolchain@nightly
 
-          # Pinning to specific nightly build for now. More recent versions
-          # introduce a lifetime check that creates a whole slew of build
-          # errors.
-
-      - name: Run cargo docs
-        # This is intended to mimic the docs.rs build
-        # environment. The goal is to fail PR validation
-        # if the subsequent release would result in a failed
-        # documentation build on docs.rs.
-        run: cargo +nightly-2025-06-05 doc --workspace --features "$FEATURES" --no-deps
-        env:
-          FEATURES: ${{needs.get-features.outputs.openssl-features}}
-          RUSTDOCFLAGS: --cfg docsrs
-          DOCS_RS: 1
+      - name: Build docs.rs
+        uses: dtolnay/install@cargo-docs-rs
 
   unused_deps:
     name: Check for unused dependencies