Add job configuration for Terraform CI/CD workflow

.github/workflows/terraform.yaml

@@ -6,3 +6,13 @@ on:
    - main
    paths:
    - terraform/**
+
+jobs:
+ terraform:
+   name: "Terraform Infrastructure Change Management"
+   runs-on: ssot-runner
+   defaults:
+     run:
+       shell: bash
+       # We keep Terraform files in the terraform directory.
+       working-directory: ./terraform