Workflow: Move owner and repo to env variable

Author: lamATnginx

.github/workflows/release-build.yml

@@ -5,6 +5,10 @@ on:
     types: 
       - published
 
+env:
+  OWNER: nginx
+  REPO: nginx-hugo-theme
+
 jobs:
   trigger-documentation-build:
     runs-on: ubuntu-latest
@@ -16,5 +20,5 @@ jobs:
             -H "Accept: application/vnd.github+json" \
             -H "Authorization: Bearer ${{ secrets.PERSONAL_ACCESS_TOKEN }}" \
             -H "X-GitHub-Api-Version: 2022-11-28" \
-            "https://api.github.com/repos/nginx/documentation/dispatches" \
+            "https://api.github.com/repos/${{ env.OWNER }}/${{ env.REPO }}/dispatches" \
             -d "{"event_type": "trigger-preview-build", "client_payload": {"environment": "preview", "hugo_theme_override": ""}}"