In order to perform CircleCI actions like Build / Re-Build directly from Squadcast, you need to Integrate CircleCI with Squadcast.
To complete this integration, follow the below steps.
Go to User settings in your CircleCI dashboard and create a new Personal API token and enter a name for the token like Squadcast.
Then click next to generate the API token and copy it.
In Squadcast Integrations page, click the Integrate button under CircleCI and enter the API key obtained from above and click save.
Your CircleCI integration is good to go and you will be able to perform CircleCI actions directly from any incident.