Github actions decline action if fails

I'm trying to use the github actions for first time, I've created and followed the tutorial from github and my .github/workflows/push_main.yml is :

name: Android CI
on:
  push:
    branches: [ main ]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v1

      - name: set up JDK 11
        uses: actions/setup-java@v1
        with:
          java-version: 11

      # Runs ktlint
      - name: Lint
        run: ./gradlew ktlintCheck

      # Execute unit tests
      - name: Unit Test
        run: ./gradlew testDebugUnitTest

Also what I'd like to have is when trying to do a rebase or merge to main have this check and if it works then keep the action of rebase or merge I thought to do something like, create a temporal branch do the check there and if it works do the rebase or merge into main and then delete the temporal branch but I don't know if there's any other efficient way to do so. Also I've seen that I can run the jobs in parallel will it make it faster?

from Github actions decline action if fails