Add OneLab Helm chart, Argo CD Application, and GitOps values for k3s

Made-with: Cursor

app/playbooks/tasks/pre-update.yml

@@ -0,0 +1,12 @@
+---
+  - name: Checking current database
+    shell: >
+      cat {{ onelab_path }}/docker-compose.yml | egrep 'image: postgres' | awk '{ print $2 }'
+    register: onelab_db
+    become: true
+
+  #
+  # Postgres pre-migration
+  #
+  - include_tasks: "{{ installer_path }}/app/playbooks/tasks/pre-db-migration.yml"
+    when: onelab_db.stdout != 'hub.andrewalliance.com/releases/postgres:17.8'