Added Github Action for virtual pages index

.github/workflows/prepare-virtual-pages-index.yml

@@ -0,0 +1,36 @@
+name: Prepare virtual pages index
+on: push
+permissions:
+  contents: write
+jobs:
+  Prepare-Virtual-Pages-Index:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          token: ${{ github.token }}
+      - name: Run build script
+        run: |
+          ./build-virtual-index.ps1
+        shell: pwsh
+      - name: Check for changes
+        run: |
+          if git diff --exit-code; then
+            echo "CHANGED=false" >>${GITHUB_ENV}
+          else
+            echo "CHANGED=true" >>${GITHUB_ENV}
+          fi
+        shell: bash
+      - name: Commit changes if they exist
+        if: env.CHANGED == 'true'
+        env:
+          GH_USERNAME: ${{ github.repository_owner }}
+          GH_USERID: ${{ github.repository_owner_id }}
+        run: |
+          git config --global user.email "${GH_USERID}+${GH_USERNAME}@users.noreply.github.com"
+          git config --global user.name "${GH_USERNAME}"
+          git add "./assets/js/virtualindex.js"
+          git commit -m "Virtual pages index updated"
+          git push
+