GitHub Actions: How to automatically pull and merge on a remote server

Question

I have a repo in GitHub with 2 branches (dev & master) and an app on a local apache server hosted in my house (the server has a public ip). Currently, whenever I make changes to dev, I push the code, make a pull request, merge the change to master and do git pull on the apache server after ssh into it.

What I want to do is to set up an automatic workflow using GitHub Actions so that the server automatically does git pull to pull the change from github whenever there is a change. I set up a workflow in yml file and self-hosted runner in the local apache server.

However, I haven't figured it out how to structure yml file. I have copied my yml file below. This yml file returns 'Already up to date' even though there is a change in the remote branch.

I found a couple of articles like this (Automatically pull from remote using GitHub Actions) in stackoverflow and it uses ssh and and also doesn't use self-hosted runner. I am confused whether i should use self-hosted or not. My thinking was since it is a local server, I have to make my server listen to the change and pull the code from github.

Can somebody help me out on this? I highly appreciate the help.

name: Test

on:
  push:
    branches: [ master ]

  workflow_dispatch:

jobs:
  build:
    runs-on: self-hosted

    steps:
      - uses: actions/checkout@v2

      - name: Pull the change from server
        env:
          USERNAME: ${{ secrets.USERNAME }}
          TOKEN: ${{ secrets.TOKEN }}
        run: | 
          git pull origin master --rebase
          echo $USERNAME
          echo $TOKEN