Make document actions kebab menu usable with keyboard only

related to WCAG 2.1 level A criteria 2.1.1: Keyboard
https://www.w3.org/TR/WCAG21/#keyboard

Make document actions kebab menu usable with keyboard only.

Element name: More menu button

Location of the element: Document actions

Steps to reproduce:
1. visit a document
2. use the keyboard tab key to access document actions
3. use tab keys then enter to access the actions in the kebab menu
4. alternate between arrow down and tab keys to access the hidden actions

=> notice that you can't go beyond action number 3 in this menu >> BUG

Recommendation to fix
RULE :
Functionality MUST be available using the keyboard, unless the functionality cannot be accomplished in any known way using a keyboard.

HOW TO FIX:
Fix this issue by ensuring the component can be used by the keyboard OR by providing a conformant alternate functionality method for the action

REFERENCE:
Deque University:https://dequeuniversity.com/class/input-methods2/keyboard-input/functionality

BACKGROUND:
Some people cannot use a mouse due to vision or motor disabilities. Content that can be operated with a mouse must also be made operable with a keyboard. When content is operable through a keyboard, it becomes operable by a variety of assistive technologies such as speech input software, sip-and-puff software, on-screen keyboards, scanning software, and alternate keyboards.