infra-cost.md

Infrastructure Cost Workflow

This workflow provides automated cost estimation for Terraform infrastructure changes using Infracost, enabling cost visibility and control in pull requests.

Usage

jobs:
  cost:
    uses: ZeroGachis/.github/.github/workflows/infra-cost.yml@v4
    with:
      infracost_terraform_workspace: production
    secrets: inherit

Inputs

Optional Inputs

Input	Default	Description
infracost_terraform_workspace	"main"	Comma-delimited list of Terraform workspaces
terraform_vars	-	Terraform variables to add to CLI

Features

• 💰 Automated cost estimation
• 📊 Pull request cost diff comments
• 🔄 Multi-workspace support
• 📝 Detailed cost breakdowns
• 🔍 Resource-level cost analysis
• 📈 Cost trend tracking

Example Usage

Basic Usage

jobs:
  cost:
    uses: ZeroGachis/.github/.github/workflows/infra-cost.yml@v4
    with:
      infracost_terraform_workspace: production

Multiple Workspaces

jobs:
  cost:
    uses: ZeroGachis/.github/.github/workflows/infra-cost.yml@v4
    with:
      infracost_terraform_workspace: staging,production

With Terraform Variables

jobs:
  cost:
    uses: ZeroGachis/.github/.github/workflows/infra-cost.yml@v4
    with:
      infracost_terraform_workspace: production
      terraform_vars: "-var='environment=production' -var='region=eu-west-3'"

Generated Report Example

The workflow generates detailed cost reports in pull requests:

💰 Infracost estimate: Monthly cost will increase by $25.10 📈

## Cost Breakdown

### Production Workspace

| Resource         | Hourly  | Monthly |
| ---------------- | ------- | ------- |
| AWS EC2 instance | $0.0342 | $24.62  |
| AWS S3 Storage   | $0.0007 | $0.48   |

### Staging Workspace

| Resource         | Hourly  | Monthly |
| ---------------- | ------- | ------- |
| AWS RDS instance | $0.0856 | $61.63  |
| AWS ECS tasks    | $0.0428 | $30.82  |

Total Monthly Change: +$117.55