Optimize IndexNow submission for efficiency and reliability

Switch to batch URL submission via JSON API to reduce individual requests,
and add HTTP status validation to fail the workflow on submission errors.

Author: thibaudgg

.github/workflows/deploy.yml

@@ -51,11 +51,23 @@ jobs:
 
       - name: Ping IndexNow
         run: |
-          for url in \
-            "https://csa-admin.org/" \
-            "https://csa-admin.org/acp/" \
-            "https://csa-admin.org/solawi/"
-          do
-            curl -s -o /dev/null -w "IndexNow %{url_effective} → HTTP %{http_code}\n" \
-              "https://api.indexnow.org/indexnow?url=${url}&key=8f940d3ccbab4035acab547df3432ac0"
-          done
+          http_code=$(curl -s -o /tmp/indexnow-response.txt -w "%{http_code}" \
+            -H "Content-Type: application/json; charset=utf-8" \
+            -d '{
+              "host":"csa-admin.org",
+              "key":"8f940d3ccbab4035acab547df3432ac0",
+              "keyLocation":"https://csa-admin.org/8f940d3ccbab4035acab547df3432ac0.txt",
+              "urlList":[
+                "https://csa-admin.org/",
+                "https://csa-admin.org/acp/",
+                "https://csa-admin.org/solawi/"
+              ]
+            }' \
+            "https://api.indexnow.org/indexnow")
+
+          echo "IndexNow canonical URL submission → HTTP ${http_code}"
+          cat /tmp/indexnow-response.txt
+
+          if [ "${http_code}" -lt 200 ] || [ "${http_code}" -ge 300 ]; then
+            exit 1
+          fi