Github Action Trunk based development IaC

A path to production using trunk based development for infrastructure as code

Published: Friday, May 24, 2024 Last modified: Saturday, Nov 1, 2025

We focus on trunk based development on main, with a re-usuable Github workflow hiding the details of the deployment:

name: CI/CD done right

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

jobs:
    deploy-to-dev:
        name: Deploy to dev
        uses: ./.github/workflows/deploy.yml
        with:
            environment: dev

    test-dev:
        uses: ./.github/workflows/test.yml
        needs:
            - deploy-to-dev
        with:
            environment: dev

    deploy-to-stg:
        name: Deploy to stg
        needs:
            - test-dev
        uses: ./.github/workflows/deploy.yml
        with:
            environment: stg

    test-stg:
        uses: ./.github/workflows/test.yml
        needs:
            - deploy-to-stg
        with:
            environment: stg

Notice dev must succeed before staging (stg) can run. Tests form a safety net before promotion.

oidc-setup/ for GCP and Github Actions

For each environment, we need to bootstrap the OIDC setup for each environment. The repo name is critical and the outputs:

Approval for production

Use Github’s environment protection rules to ensure we don’t deploy to production without approval.

View the full Terraform example on Github.