Update docs.yml

.github/workflows/docs.yml

@@ -25,8 +25,12 @@ jobs:
       ##################
       # Remove this section if you don't want docs to be made
       - name: Install elan
-        run: curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf | sh -s -- -y --default-toolchain leanprover/lean4:4.0.0
-
+        run: |
+          set -o pipefail
+          curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf | sh -s -- --default-toolchain none -y
+          ~/.elan/bin/lean --version
+          echo "$HOME/.elan/bin" >> $GITHUB_PATH
+          
       - name: Get cache
         run: lake -Kenv=dev exe cache get || true