chore: deploy nginx workflow (#2090)

New workflow for apify-docs nginx deployment to be tested while also
keeping the current solution working

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Adds a GitHub Actions workflow to trigger Nginx config deployment in
apify/apify-docs-private on nginx.conf changes or manual dispatch.
> 
> - **CI/CD**:
>   - **New workflow** `/.github/workflows/deploy-nginx.yml`:
> - Triggers on `push` to `master` when `nginx.conf` changes and via
`workflow_dispatch`.
> - Executes `gh workflow run deploy-nginx.yaml` against
`apify/apify-docs-private` with `deployment=apify-docs`.
> - Uses `GITHUB_TOKEN` from
`secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
3ed86df. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: markubra

.github/workflows/deploy-nginx.yml

@@ -0,0 +1,25 @@
+# Triggers deployment of the Nginx reverse proxy configuration for docs.apify.com
+# when the configuration file is updated in this repository.
+name: Deploy Nginx Configuration
+
+on:
+  # push:
+  #   branches:
+  #     - master
+  #   paths:
+  #     - 'nginx.conf'
+  workflow_dispatch:
+
+jobs:
+  trigger-deployment:
+    name: Trigger Nginx deployment
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger deployment workflow in apify-docs-private
+        run: |
+          gh workflow run deploy-nginx.yaml \
+            --repo apify/apify-docs-private \
+            --field deployment=apify-docs
+          echo "✅ Deployment workflow triggered successfully"
+        env:
+          GITHUB_TOKEN: ${{ secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN }}