Enable index page for docs

.github/workflows/ci.yml

@@ -10,6 +10,8 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
+  # Nightly Rust necessary for building docs.
+  RUST_NIGHTLY_VERSION: nightly-2024-08-01
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
@@ -69,7 +71,7 @@ jobs:
   document:
     needs:
      - build_and_test
-    if: github.event_name == 'push' && github.ref_type == 'branch'
+    # if: github.event_name == 'push' && github.ref_type == 'branch'
     permissions:
       contents: write
     runs-on: ubuntu-latest
@@ -80,15 +82,15 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: stable
+          toolchain: ${{ env.RUST_NIGHTLY_VERSION }}
       - name: Rust Cache
         uses: Swatinem/rust-cache@v2
 
       - name: Build docs
         run: |
           cargo clean --doc && \
-          cargo rustdoc -p zksync_vm2_interface && \
-          cargo rustdoc -p zksync_vm2
+          cargo rustdoc -p zksync_vm2_interface -- -Z unstable-options --enable-index-page && \
+          cargo rustdoc -p zksync_vm2 -- -Z unstable-options --enable-index-page
 
       - name: Deploy
         uses: JamesIves/github-pages-deploy-action@v4