How can I run parallel jobs in GitHub Actions?

How can I run parallel jobs in GitHub Actions?

You can run parallel jobs in GitHub Actions by defining multiple jobs in your workflow YAML file and using the needs keyword to control their execution order.

Can you give me an example of a YAML configuration for that?

Sure! Here's a simple example:

jobs:
  job1:
    runs-on: ubuntu-latest
    steps:
      - name: Step 1
        run: echo 'This is job 1'

  job2:
    runs-on: ubuntu-latest
    steps:
      - name: Step 2
        run: echo 'This is job 2'

  job3:
    runs-on: ubuntu-latest
    needs: [job1, job2]
    steps:
      - name: Step 3
        run: echo 'This is job 3'

In this example, job3 will only run after job1 and job2 have completed.

What happens if one of the jobs fails?

If a job fails, any jobs that depend on it (using the needs keyword) will not run. You can also set up conditions to handle failures.

Can I run jobs in parallel without dependencies?

Yes, jobs can run in parallel by default if they don't have any dependencies defined. Just list them under the jobs section.