[NEW] New module: attachment_attach_non_editable

In odoo, by default, you can't add attachments to a record if the form view
is set as not editable (``edit='false'`` in the form tag)

This module adds a new form view attribute, ``attach=``, which lets you
enable attachment uploads even in non-editable forms.

attachment_attach_non_editable/static/src/xml/sidebar.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates id="template" xml:space="preserve">
+
+  <t t-extend="Sidebar">
+    <t t-jquery=".o_sidebar_add_attachment">
+      this.attr('t-if', "section.name == 'files' and (widget.options.editable or widget.options.attachable)");
+    </t>
+  </t>
+
+</templates>