Try this

.github/workflows/ci.yml

@@ -14,15 +14,32 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
         uses: ocaml/setup-ocaml@v2
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
+
       - name: Install locally
         run: opam install . --deps-only --with-test
+
       - name: Build locally
         run: opam exec -- dune build
+
       - name: Run tests locally
         run: opam exec -- dune runtest
+
+      - name: Build documentation
+        run: opam exec -- dune build @doc
+
+      - name: Set-up Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v2
+        with:
+          path: _build/default/_doc/_html
+
       - name: Deploy odoc to GitHub Pages
-        uses: ocaml/deploy-doc@v2
+        id: deployment
+        uses: actions/deploy-pages@v3