Update workflows and backend configuration for OpenTofu migration

[brettcurtis]

• Updated workflow references to use OpenTofu v0.2.9 in non-production, production, and sandbox YAML files.
• Added KMS encryption key parameter to workflows.
• Enhanced backend configuration in backend.tofu for GCS with KMS encryption.
• Introduced state management variables in variables.tofu for better configuration handling.

Summary by CodeRabbit

• New Features

  • Enables encryption for Terraform/OpenTofu state and plans using a KMS key, with safe migration from unencrypted state.
  • Introduces configurable state storage (bucket, key, and prefix) via variables for flexible environment setup.
  • Adds a mechanism to force re-apply when needed.

• Chores

  • Updates CI workflows to a newer reusable workflow version.
  • Replaces legacy passphrase usage with KMS-based configuration in CI.
  • Adds provider lock for the null provider to ensure consistent builds.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Updates GitHub Actions workflows to a newer reusable workflow version with new KMS input and removed GPG secret. Introduces OpenTofu state/plan encryption via GCP KMS, switches backend settings to variables, and adds a null_resource for forced applies. Adds new state-related variables. Updates lockfile with hashicorp/null provider.

Changes

Cohort / File(s)	Summary of changes
GitHub Actions workflows .github/workflows/non-production.yml, .github/workflows/production.yml, .github/workflows/sandbox.yml	Bumps reusable workflow ref to e3c59e4 (# v0.2.9); adds input opentofu_kms_encryption_key with environment-specific KMS paths; removes gpg_passphrase secret input.
OpenTofu backend and encryption config backend.tofu, main.tofu, variables.tofu	Backend: replaces hard-coded GCS prefix with var.state_bucket, var.state_prefix, and var.state_kms_encryption_key. Main: adds encryption config (GCP KMS key provider, AES-GCM with unencrypted migration fallback) and null_resource "force_apply" using timestamp() trigger. Variables: adds state_bucket, state_kms_encryption_key, state_prefix.
Provider lockfile .terraform.lock.hcl	Adds provider lock for registry.opentofu.org/hashicorp/null v3.2.4 with checksums; no other entries changed.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• Migrate to OpenTofu #297 — Also updates the same reusable workflow invocation and inputs, indicating a coordinated workflow version/input change.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9f9cff3 and 64a6736.

📒 Files selected for processing (7)

• .github/workflows/non-production.yml (1 hunks)
• .github/workflows/production.yml (1 hunks)
• .github/workflows/sandbox.yml (1 hunks)
• .terraform.lock.hcl (1 hunks)
• backend.tofu (1 hunks)
• main.tofu (2 hunks)
• variables.tofu (1 hunks)

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