use chromium to run karma on arm machines
use chromium to run karma on arm machines

flags=none

test plan:
 - On an ARM based machine (such as a MacBook with an m1)
   - Make sure js-tests.override.yml is in your COMPOSE_FILE
   - docker compose up js-tests

Change-Id: Id117329bb221e3f62d5071878253561b76315ed9
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/302964
Reviewed-by: Aaron Ogata <11ccf682c06d1508642f943a3962a1c3d00b8e44@instructure.com>
Build-Review: Aaron Ogata <11ccf682c06d1508642f943a3962a1c3d00b8e44@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Keith Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>
Product-Review: Keith Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>

sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms