Github Actions repository_dispatch example

from.yaml

name: Build Artifacts

on: [push]

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v1
      with:
        fetch-depth: 1

    - name: call the other repo
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        EVENT: YOUR_EVENT_TYPE
        ORG: YOUR_ORG_NAME
        REPO: YOUR_REPO_NAME
      run: |
        curl -d "{\"event_type\": \"${EVENT}\"}" -H "Content-Type: application/json" -H "Authorization: token ${GITHUB_TOKEN}" -H "Accept: application/vnd.github.everest-preview+json" "https://api.github.com/repos/${ORG}/${REPO}/dispatches"

to.yaml

name: dispatch receiver

on: [repository_dispatch]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - name: dispatch trigger
      if: github.event.action == "YOUR_EVENT_TYPE"
      run: |
        echo "repository_dispatch triggered"

Your repository_dispatch receiver yaml config have to be in the repo default branch.

Just posting here since it doesn't seem to be documented - you can also specify a list of types to trigger on:

on:
  repository_dispatch:
    types:
      - manual-trigger-mytest
      - manual-trigger-all

and triggered with

curl -H "Accept: application/vnd.github.everest-preview+json" \
    -H "Authorization: token <token>" \
    --request POST \
    --data '{"event_type": "manual-trigger-mytest"}' \
    https://api.github.com/repos/<org>/<repo>/dispatches

(credit to https://goobar.io/2019/12/07/manually-trigger-a-github-actions-workflow/)