try

.gitea/workflows/gitea_deploy.yml

@@ -4,11 +4,11 @@ run-name: ${{ gitea.actor }} build image and push to container registry
 on:
   push:
     branches:
-      - main
+      - deploy_custom
 
 jobs:
   build-and-deploy:
-    runs-on: []  # todo
+    runs-on: [ubuntu-latest]  # todo
 
     steps:
       - name: Checkout code