cd: enable cron job, set helm chart to version 12.4.0

.gitea/workflows/app-continous-deploy.yaml

@@ -1,4 +1,6 @@
 on:
+  schedule:
+    - cron: '0 9 * * 0' # every sunday 9 am
   push:
     branches:
       - main

ops-scripts/apply-app.sh

@@ -15,7 +15,7 @@ if [ -n "${APP_HELM_VALUE_GITEA_ADMIN_USERNAME:-}" ]; then
 
     helm repo add gitea-charts https://dl.gitea.com/charts/
     helm repo update
-    helm upgrade --install gitea gitea-charts/gitea \
+    helm upgrade --install gitea gitea-charts/gitea --version 12.4.0 \
     --values deploy/helm/values.yaml \
     --set valkey.global.valkey.password=${APP_HELM_VALUE_VALKEY_GLOBAL_PASSWORD} \
     --set postgresql.global.postgresql.auth.postgresPassword=${APP_HELM_VALUE_POSTGRESQL_AUTH_POSTGRESPASSWORD} \