terraform plan

1. infracost breakdown --path . --terraform-parse-hcl  --format json --out-file /tmp/infracost.json
2. ./infracost comment github --path /tmp/infracost.json --repo $GITHUB_REPOSITORY --github-token ${{ secrets.GITHUB_TOKEN }} --pull-request ${{github.event.pull_request.number}} --github-api-url https://<internal_git_repo> --behavior update --policy-path cost-policy.rego

name: Terraform directory
on: [pull_request]

jobs:
  terraform-directory:
    name: Terraform directory
    runs-on: ubuntu-latest

    steps:
      # Checkout the branch you want Infracost to compare costs against. This example is using the 
      # target PR branch.
      - name: Checkout base branch
        uses: actions/checkout@v2
        with:
          ref: '${{ github.event.pull_request.base.ref }}'

      - name: Setup Infracost
        uses: infracost/actions/setup@v1
        with:
          api-key: ${{ secrets.INFRACOST_API_KEY }}

      # Generate an Infracost output JSON from the comparison branch, so that Infracost can compare the cost difference.
      - name: Generate Infracost cost snapshot
        run: |
          infracost breakdown --terraform-parse-hcl --path examples/terraform-directory/code \
                              --format json \
                              --out-file /tmp/prior.json
          
      # Checkout the PR branch with your infrastructure changes.
      - uses: actions/checkout@v2

      - name: Run Infracost
        run: |
          infracost breakdown --terraform-parse-hcl --path examples/terraform-directory/code \
                              --format json \
                              --compare-to /tmp/prior.json \
                              --out-file /tmp/infracost.json

      - name: Post Infracost comment
        run: |
          # Posts a comment to the PR using the 'update' behavior.
          # This creates a single comment and updates it. The "quietest" option.
          # The other valid behaviors are:
          #   delete-and-new - Delete previous comments and create a new one.
          #   hide-and-new - Minimize previous comments and create a new one.
          #   new - Create a new cost estimate comment on every push.
          # See <https://www.infracost.io/docs/features/cli_commands/#comment-on-pull-requests> for other options.
          infracost comment github --path /tmp/infracost.json \
                                   --repo $GITHUB_REPOSITORY \
                                   --github-token ${{github.token}} \
                                   --pull-request ${{github.event.pull_request.number}} \
                                   --behavior update

infracost breakdown …

infracost diff …

--compare-to

infracost diff

infracost diff --path=. --compare-to=prior.json --terraform-parse-hcl --format=json

docker run --rm -e INFRACOST_API_KEY=<key> -e -v $PWD/:/code/ infracost/infracost --version