costerra v0.1.0

First public release.

Added

Estimates

• Static evaluation of Terraform and Terragrunt (variables, tfvars, locals,
  count / for_each, dynamic blocks, ~90 built-in functions, local and
  remote modules, Terragrunt includes and dependencies) and of plan JSON, with
  no terraform init and no credentials.
• 122 priced Google Cloud resource types, about 300 more known to be free.
• Prices from the Cloud Billing Catalog API, cached locally; contract prices of
  your billing account (detected automatically), refreshed in the background.
• Sustained use discounts, licenses, GPUs, tiered rates, Spot pricing and
  regional differences; free tiers listed per service (region-aware).
• Usage files (Infracost-compatible) with warnings for unknown keys and
  addresses matching no resource; usage init template generator; small /
  medium / large example usage profiles.
• One project per environment tfvars file (environments/*.tfvars…).

Recommendations

• 120+ optimization rules with estimated monthly savings (Spot for non-prod,
  machine families, committed use discounts, idle resources, lifecycle
  policies, cheaper regions…); the savings total counts the best option per
  resource.
• Usage-based recommendations from Google Cloud Recommender (paginated) and
  Rabbit (experimental), matched to the resources in the code.
• Opt-in Rabbit AI cost review (--rabbit-review): git-ignored, hidden and
  excluded files (exclude_paths, .costerraignore) are never uploaded,
  secret values are redacted, files over the upload budget are reported, and
  --rabbit-review-dry-run shows what would be sent. Credentials embedded in
  git remote URLs are never sent, cached or printed.

Outputs and CI

• Terminal table (identical instances grouped as name[*] ×N, --no-group),
  JSON (with plan_diff for plans) and Markdown merge / pull request comments.
• Cost diffs against a git ref (read-only, with git archive) or a saved
  report; policies (--fail-above, --fail-increase-above,
  --fail-increase-percent) with exit code 2.
• Strict costerra.yml (unknown keys and invalid globs are errors); YAML 1.2
  semantics, as in Terraform's yamldecode.
• pricing sync --if-older-than for CI caches; boolean environment variables
  accept 1/0/yes/no.
• Ready-to-use CI jobs for GitLab (ci/gitlab-ci.yml) and GitHub
  (ci/github-actions.yml) that create or update one cost comment.
• Container image: multi-arch, non-root, Wolfi base with git, curl and jq.
• Release binaries for Linux (x86_64, aarch64) and macOS (Intel, Apple
  silicon), with checksums and build provenance.

Project

• Apache License 2.0; contributing guide, security policy and code of conduct.
• Unit, golden-value (committed price list, no network) and end-to-end CLI
  tests; minimum supported Rust version 1.89.
• GitHub Actions: lint, tests on Linux x86_64 / arm64 and macOS, MSRV check,
  cargo-deny, osv-scanner, trivy, CodeQL, image publishing, releases with
  crates.io trusted publishing, weekly advisory and catalog drift checks;
  Dependabot.