use Swift 5.10 to build docs

.github/workflows/documentation.yml

@@ -9,10 +9,11 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    container: 
+      image: swift:5.10
 
     steps:
       - uses: actions/checkout@v4
-
       - name: Build Docs
         run: |
           mkdir -p ./gh-pages
@@ -23,7 +24,19 @@ jobs:
                                    --transform-for-static-hosting \
                                    --hosting-base-path OpenAPIKit \
                                    --target OpenAPIKit
+      - uses: actions/cache/save@v4
+        with:
+          path: ./gh-pages
+          key: ${{ github.run_number }}-pages
 
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache/restore@v4
+        with:
+          path: ./gh-pages
+          key: ${{ github.run_number }}-pages
       - name: Deploy to GitHub Pages
         uses: JamesIves/github-pages-deploy-action@v4.5.0
         with: