Trigger deploy stage workflow on push to stage branch

.gitea/workflows/deploy_stage.yml

@@ -1,13 +1,17 @@
 name: Deploy into stage environment
-on: workflow_dispatch
+on:
+  push:
+    branches:
+      - stage
+  workflow_dispatch:
 
 jobs:
   make-deploy:
     name: Deploy into stage environment
     runs-on: [django-dav-events, kitty]
     steps:
-      - name: "Checkout the repository"
-        run: git clone "${{ gitea.server_url }}/${{ gitea.repository }}" ./repository
+      - name: "Checkout stage branch of the repository"
+        run: git clone -b stage "${{ gitea.server_url }}/${{ gitea.repository }}" ./repository
       - name: "Run make deploy"
         working-directory: ./repository
         env: