Run test on pull request

Deploy.yaml

name: Deploy on Push

on: 
  push:
    branches:
      - Dev

jobs:
  test:
  
    runs-on: ubuntu-latest
    
    steps:
      - uses: actions/checkout@v2
      - uses: sfdx-actions/setup-sfdx@v1
        with:
          sfdx-auth-url: ${{ secrets.AUTH_SECRET }}
      - name: sfdx-test-run
        run: sfdx force:apex:test:run -l RunLocalTests -w 30
      - name: 'Convert Metadata'
        run: sfdx force:source:convert --rootdir=force-app --outputdir=convert
      - name: 'Run Test on Metadata'
        run: sfdx force:mdapi:deploy --deploydir=convert --testlevel=RunLocalTests --checkonly

Test.yaml

name: Test On PullRequest

on: 
  pull_request:
    branches: [ Dev ]

jobs:
  test:
  
    runs-on: ubuntu-latest
    
    steps:
      - uses: sfdx-actions/setup-sfdx@v1
        with:
          sfdx-auth-url: ${{ secrets.AUTH_SECRET }}
      - name: sfdx-test-run
        run: sfdx force:apex:test:run -l RunLocalTests -w 30