automatic tests workflow main.yml (run tests when pushed to my-other-branch, using my-other-branch code)

main.yml

name: CI

on:
  push:
    branches:
      - my-other-branch # this references the branch on which a push should trigger the action

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@master
      with:
        ref: my-other-branch # this references the branch that has the action's code you want to use
      name: Checkout
    - uses: ./.github/actions/automatic-tests
      name: Test