Deploy branch on Heroku via API [duplicate] - github

Question

This question already has answers here:
Redeploy Heroku app without code changes
(7 answers)
Closed 4 years ago.
I have an application set up on heroku that is automatically deployed via GitHub. That setup is great and I don't want to change anything.
There is a use case now where I need to deploy the application from time to time without code changes (the build process fetches some recent data).
I can easily redeploy an app by going to the user interface and clicking "deploy a branch". However I would love to do this via an API. I could not find anything that helped achieve this in the Heroku Platform API Documentation.
I can create a Deployment via the GitHub deployment API but that doesn't seem to trigger a deployment on Heroku.
Any leads on how I can trigger a deployment for a specific app on Heroku?
Edit: I can't really make use of the answer Redeploy Heroku app without code changes as there is no answer that offers this functionality via an HTTP API.

Answer 1

Heroku doesn't currently have a public API for GitHub Sync. So you will need to use their Platform API to create a build.
GitHub gives you a tar.gz under the URL https://github.com/<organization>/<repository>/archive/master.zip (you need to pass an authorization token in the headers of course).
Using curl, you can do the following:
curl -n -v https://github.com/<organization>/<repository>/archive/master.zip
That URL will be a redirection to a URL on GitHub authenticated to allow the download. Reuse that URL to create an Heroku build:
curl -n -X POST https://api.heroku.com/apps/<app name>/builds \
-d '{
"source_blob": {
"url": "<the URL fetched before>",
"version": "<the version of the code you're trying to deploy>"
}
}' \
-H "Content-Type: application/json" \
-H "Accept: application/vnd.heroku+json; version=3"
That will trigger a new build, downloading the code from GitHub. Effectively doing the same as GitHub Sync internally does.
You can also see this tutorial: https://devcenter.heroku.com/articles/build-and-release-using-the-api