GitHub Actions: on:

https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#on

on: push
on: [push,fork]
on: schedule
on: workflow_dispatch # for manual trigger 
on: workflow_call     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#onworkflow_call

on: ['deployment'] (GitHub Actions helm deployments)

on:
  push:
    branches:
      - main
      - develop

on:
  schedule:
    # * is a special character in YAML so you have to quote this string
    - cron:  '30 5,17 * * *'

Related

• GitHub Actions: events that trigger workflows
• GitHub Actions: runs-on:
• GitHub Actions: inputs:
• GitHub Actions: schedule:
• Azure Pipelines: trigger
• when: (GitLab)
• Workflow does not exist or does not have a workflow_dispatch trigger in this branch.

See also

• GitHub Actions, act, .github/workflows/, ~/actions-runner/, svc.sh, deploy:, run:, runs-on:, uses:, steps:, jobs:, on:, env:, uses:, script:, continue-on-error:, template:, aws-actions, inputs:, GITHUB_ENV, needs:, github., GitHub runner, my-docker-publish.yml, GitHub Actions variables, GitHub Actions contexts, GitHub Actions Importer, If:, SLSA, Actions Runner Controller (ARC), $GITHUB OUTPUT, notify:, Marketplace, GITHUB_TOKEN
• GitHub, GitHub Actions, GitHub Actions Runner, Events, CodeQL, GitHub Desktop, GitHub organization, base permissions, GitHub Copilot, .gitignore, GitHub Codespaces, GitHub Marketplace, GitHub Apps, GitHub Enterprise Server, GitHub CLI (gh), Dependabot, GitHub security, .github/, GitHub code scanning, GitHub Pages, GitHub Packages, GitHub Advanced Security, GitHub Mobile, GitHub Importer, GitHub versions, SSH keys

https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#workflow_dispatch