HashiCorp Packer

FEATURES: - provenance: add new provenance post-processor and packer verify-attestation command for SLSA Build L1/L2 supply-chain attestations. Derives in-toto subjects from Packer artifacts, builds SLSA Provenance v1 predicates with Git/CI metadata, and signs via local PEM key, cloud KMS (awskms://, gcpkms://, azurekms://, hashivault://), or keyless Sigstore (Fulcio + optional Rekor transparency log). Reference CI workflows for L2 keyless and L3-compatible delegated-signing patterns are included under examples/ci/. GH-13667 - core/hcl2: add rfc3339_parse and unix_timestamp_parse template functions. Both accept RFC 3339 timestamps; unix_timestamp_parse additionally accepts Unix epoch integers. GH-13669 - core/hcl2: add continue_on_error meta-argument to provisioner blocks. When set to true, a provisioner failure is logged and the build continues rather than halting. GH-13674 - core/hcl2: variable object types now support optional() attribute modifiers, allowing object variables to declare per-attribute defaults and omit fields that have a default set. GH-13670 BUG FIXES: - plugin/getter: prevent path traversal vulnerability in GitHub plugin getter filename handling. GH-13680 - build: update build constraints to support arm architecture on FreeBSD. GH-13650 SECURITY: - security: drop x/crypto/openpgp by upgrading go-github v33 → v75. GH-13676 - security: suppress false positive for GO-2026-5932. GH-13677 - deps: bump golang.org/x/crypto to v0.54.0. GH-13672 DEPENDENCIES: - deps: bump github.com/hashicorp/packer-plugin-sdk to v0.6.10. GH-13673 - deps: bump github.com/hashicorp/hcp-sdk-go to v0.174.0. GH-13673 - deps: bump github.com/zclconf/go-cty to v1.18.1. GH-13673 - deps: bump github.com/google/go-github v33 → v75. GH-13676 - deps: bump golang.org/x/net to v0.56.0. GH-13664 - deps: update various Go module dependencies. GH-13673 INTERNAL: - ci: pin GitHub Action refs to latest verified SHAs. GH-13675 - chore: remove old website references. GH-13668