Add a proxmox_no_nag role that hides the subscription dialog and reapplies it from an apt hook after every widget-toolkit update

proxmox_no_nag/files/86pve-no-nag

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+DPkg::Post-Invoke { "/usr/local/sbin/pve-no-nag"; };

proxmox_no_nag/files/pve-no-nag

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+#!/bin/sh
+# Disables the "No valid subscription" dialog of the Proxmox web UI. Called by the apt hook
+# 86pve-no-nag, because every proxmox-widget-toolkit update restores the file. Without a match
+# (changed upstream code) the dialog returns and nothing breaks.
+f=/usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js
+[ -f "$f" ] && sed -i 's/checked_command: function (orig_cmd) {$/& orig_cmd(); return;/' "$f"
+exit 0

proxmox_no_nag/tasks/main.yml

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+- name: Install the subscription nag remover
+  copy:
+    src: pve-no-nag
+    dest: /usr/local/sbin/pve-no-nag
+    mode: "0755"
+
+- name: Run it after every dpkg run
+  copy:
+    src: 86pve-no-nag
+    dest: /etc/apt/apt.conf.d/86pve-no-nag
+    mode: "0644"
+
+- name: Remove the subscription nag
+  command: /usr/local/sbin/pve-no-nag
+  changed_when: false