Add automatic PR validation workflow integrated with Zola deployment

.github/workflows/zola-deploy.yml

@@ -3,6 +3,8 @@ name: Deploy website
 on:
   push:
     branches: ["main"]
+  pull_request:
+    branches: ["main"]
   repository_dispatch:
     types: [deploy]
   workflow_dispatch:
@@ -16,10 +18,12 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout prod
+      - name: Checkout
         uses: actions/checkout@v4
         with:
-          ref: main
+          ref: >-
+            ${{ github.event_name == 'pull_request' &&
+                github.head_ref || 'main' }}
           path: website
 
       - name: Checkout valkey-doc
@@ -37,38 +41,45 @@ jobs:
       - name: Checkout valkey-bloom
         uses: actions/checkout@v4
         with:
-            repository: valkey-io/valkey-bloom
-            path: valkey-bloom
+          repository: valkey-io/valkey-bloom
+          path: valkey-bloom
 
       - name: Checkout valkey-search
         uses: actions/checkout@v4
         with:
-            repository: valkey-io/valkey-search
-            path: valkey-search
+          repository: valkey-io/valkey-search
+          path: valkey-search
 
       - name: Checkout valkey-json
         uses: actions/checkout@v4
         with:
-            repository: valkey-io/valkey-json
-            path: valkey-json
+          repository: valkey-io/valkey-json
+          path: valkey-json
 
       - name: Init commands, topics and clients
         run: |
           cd website
-          ./build/init-topics-and-clients.sh ../valkey-doc/topics ../valkey-doc/clients
-          ./build/init-commands.sh ../valkey-doc/commands ../valkey/src/commands ../valkey-bloom/src/commands ../valkey-json/src/commands ../valkey-search/src/commands
+          ./build/init-topics-and-clients.sh ../valkey-doc/topics \
+            ../valkey-doc/clients
+          ./build/init-commands.sh ../valkey-doc/commands \
+            ../valkey/src/commands ../valkey-bloom/src/commands \
+            ../valkey-json/src/commands ../valkey-search/src/commands
 
       - name: Build only
         uses: shalzz/[email protected]
         env:
           BUILD_DIR: website
           BUILD_ONLY: true
           BUILD_THEMES: false
+
       - name: Upload artifact
+        if: github.event_name != 'pull_request'
         uses: actions/upload-pages-artifact@v3
         with:
           path: ./website/public
+
   deploy:
+    if: github.event_name != 'pull_request'
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}