chore(deps): update bcgov/action-builder-ghcr action to v4.2.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
bcgov/action-builder-ghcr	action	patch	v4.2.0 -> v4.2.1

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Release Notes

bcgov/action-builder-ghcr (bcgov/action-builder-ghcr)

v4.2.1

Compare Source

What's Changed

• chore(deps): update docker/metadata-action digest to 318604b by @​renovate[bot] in #​123
• fix: SBOM generation handling, permission checks by @​DerekRoberts in #​124
• chore: remove keep_versions, keep_regex inputs by @​Copilot in #​119
• doc: OCI-compliant labels generated by metadata-action by @​Copilot in #​122
• chore: use actions/attest-build-provenance by @​DerekRoberts in #​99
• feat: add docker/metadata-action for automatic tag and label generation by @​Copilot in #​118

Full Changelog: bcgov/action-builder-ghcr@v4.2.0...v4.2.1

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