Introduce Artifact Attestations (#2038)

Author: wata727

.github/workflows/release.yml

@@ -10,6 +10,7 @@ on:
 permissions:
   contents: write
   id-token: write
+  attestations: write
 
 jobs:
   goreleaser:
@@ -32,3 +33,6 @@ jobs:
         args: release --rm-dist --release-notes tools/release/release-note.md
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - uses: actions/attest-build-provenance@v1
+      with:
+        subject-path: 'dist/checksums.txt'

README.md

@@ -40,13 +40,24 @@ NOTE: The Chocolatey package is NOT directly maintained by the TFLint maintainer
 
 ### Verification
 
-Releases are signed by [Cosign](https://github.com/sigstore/cosign). `cosign verify-blob` ensures that the release was built with this repository's GitHub Actions.
+#### Cosign
 
-```
+[Cosign](https://github.com/sigstore/cosign) `verify-blob` command ensures that the release was built with GitHub Actions in this repository.
+
+```console
 cosign verify-blob --certificate=checksums.txt.pem --signature=checksums.txt.keyless.sig --certificate-identity-regexp="^https://github.com/terraform-linters/tflint" --certificate-oidc-issuer=https://token.actions.githubusercontent.com checksums.txt
 sha256sum --ignore-missing -c checksums.txt
 ```
 
+#### GitHub CLI (Beta)
+
+[Artifact Attestations](https://docs.github.com/en/actions/security-guides/using-artifact-attestations-to-establish-provenance-for-builds) are available that can be verified using the GitHub CLI.
+
+```console
+gh attestation verify checksums.txt -R terraform-linters/tflint
+sha256sum --ignore-missing -c checksums.txt
+```
+
 ### Docker
 
 Instead of installing directly, you can use the Docker image: