Verify the release signature; fix the README's Terraform example

[drk1rd]

Signature verification. HomeCloud releases from v0.5.0 on publish checksums.txt.sigstore.json, a Sigstore bundle made by keyless signing in the release workflow. The action now verifies it before trusting checksums.txt:

cosign verify-blob checksums.txt --bundle checksums.txt.sigstore.json \
  --certificate-identity https://github.com/solinode/homecloud/.github/workflows/release.yml@refs/tags/<tag> \
  --certificate-oidc-issuer https://token.actions.githubusercontent.com

• latest is resolved to its tag first (from the /releases/latest redirect), so the identity is exact and every file comes from the same release.
• A v0.5.0+ release without a bundle fails the step. Releases before v0.5.0 are unsigned and keep the checksum-only check, as before.
• cosign: the runner's own if it is on PATH (e.g. from sigstore/cosign-installer), otherwise cosign v3.1.3 is downloaded from its GitHub release and checked against SHA-256s pinned in setup.sh. This is a JavaScript action (for the post step), so it cannot call sigstore/cosign-installer itself.
• New input verify-signature (default true); false checks the checksum only, e.g. on runners that cannot reach Sigstore.
• HC_INSTALL_ONLY=1 stops setup.sh after the install, for tests. test.yml gets an install matrix: latest and v0.5.0 (signed), v0.4.1 (unsigned), v0.5.0 with the check off. test/inputs.sh covers the new input.

README. The Terraform example set skip_credentials_validation and skip_requesting_account_id, which are not needed (HomeCloud implements STS); it now sets only s3_use_path_style, matching the mirror in solinode/homecloud integrations/github-action. The inputs table and the intro list cover the signature check, and a new Release verification section explains it.

Tested locally (macOS arm64): v0.5.0 verifies with the downloaded cosign; v0.4.1 installs with the checksum only; latest with verify-signature=false skips the check; a tampered checksums.txt fails cosign verify-blob; bash test/inputs.sh passes.

Summary by CodeRabbit

• New Features
  • Installations now verify release signatures by default before trusting checksums. Signature verification can be disabled to use checksum-only verification.
  • Older unsigned releases continue to use checksum verification.
• Bug Fixes
  • Release downloads now use the resolved version-specific release, including when latest is selected.
• Documentation
  • Updated guidance for release verification and HomeCloud’s Terraform credential validation support.

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⚙️ Run configuration

• Configuration used: defaults
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📥 Commits

Reviewing files that changed from the base of the PR and between 53f0959 and 21726c8.

📒 Files selected for processing: 1

• .github/workflows/test.yml

📝 Walkthrough

The action adds optional Sigstore verification for release checksums, with verification enabled by default. The installer resolves release tags, verifies signed releases, and checks archive checksums. The workflow tests installation cases. The README also updates Terraform provider guidance.

Changes: Release Verification

Layer / File(s)	Summary
Verification input and validation action.yml, main.js, setup.sh, test/inputs.sh, README.md	The action adds verify-signature, defaults it to true, and passes it to setup.sh. The script accepts case-insensitive true or false. Tests cover accepted and rejected values, and the README documents the input.
Release resolution and signature checks setup.sh, README.md	The installer resolves latest to a release tag and uses version-specific release URLs. For signed releases, it verifies the Sigstore bundle with cosign before checking the archive against checksums.txt. The README describes the release verification behavior.
Install-only verification matrix setup.sh, .github/workflows/test.yml	The installer can exit after installation and version reporting. The workflow exercises signed and unsigned versions with verification enabled and disabled, then checks the expected status message and checksum result.

Terraform Provider Guidance

Layer / File(s)	Summary
Terraform provider configuration README.md	The README states that HomeCloud implements STS and removes the provider settings that skipped credential validation and account-ID requests. It retains s3_use_path_style = true.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant ActionInput
  participant mainjs
  participant setupsh
  participant GitHubReleases
  participant cosign
  ActionInput->>mainjs: provide verify-signature
  mainjs->>setupsh: pass HC_VERIFY_SIGNATURE
  setupsh->>GitHubReleases: resolve release tag and fetch verification assets
  setupsh->>cosign: verify checksums bundle signature
  setupsh->>GitHubReleases: download release archive
  setupsh->>setupsh: compare archive SHA-256 with checksums.txt

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Merge Risk: 🔵 Low · up to 53f09

The only open item is a small CI hardening fix: disable credential persistence on the new install job's checkout step. It does not affect the action's runtime behavior.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files. (3 skipped: 3…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies both main changes: release-signature verification and the Terraform example update.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files. (3 skipped: 3 unsupported.)

✨ Finishing Touches: 💡 1

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @.github/workflows/test.yml:
- Line 62: Update the actions/checkout step in the install job to set
persist-credentials to false, preventing checkout from retaining the GitHub
token in local Git configuration.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 837aeb41-f2b9-410c-9b15-190e96b01c5f

📥 Commits

Reviewing files that changed from the base of the PR and between 2347213 and 53f0959.

📒 Files selected for processing: 6

• .github/workflows/test.yml
• README.md
• action.yml
• main.js
• setup.sh
• test/inputs.sh

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