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GitHub action runnner on demand function

An AWS function that checks whether recieved check_run is allowed to run and tells runner admin what to do in the log.

To setup you need

  1. a repo with a Self hosted runner registered, but offline
  2. a AWS profile called serverless to use for deploying the AWS Lambda function, use ./policy.json as the policy for the user.
  3. node.js

Deploy

npx serverless deploy

It should output a endpoint URL.

Setup web hook

In GH repo settings create a new web hook.

  • Use endpoint URL from deploy as Payload URL
  • Use content type application/json
  • Select only Check runs event

Test

Make change to repo to trigger a check_run webhook.

In AWS console go to log events of the check_run Lambda function and follow instructions that appear in the log. The log message should tell you to start/stop runner or cancel workflow.

Undeploy

Remove webhook in GitHub

Remove AWS function with

npx serverless remove