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a17bdc7c89* Sign published container images * Attest per-platform SPDX SBOMs with cosign Extract each platform's SPDX document from the BuildKit SBOM attestation and sign it as a cosign spdxjson attestation against the manifest-list digest, so downstream consumers (e.g. Kyverno image-verification policies) can verify the predicate signature rather than relying on the unsigned BuildKit attachment.
98 lines
3.2 KiB
YAML
98 lines
3.2 KiB
YAML
name: Publish Docker image
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on:
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workflow_dispatch:
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push:
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tags:
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- "v*"
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permissions: {}
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concurrency:
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group: ${{ github.workflow }}-${{ github.ref }}
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jobs:
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push_to_registry:
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name: Push Docker image to GHCR
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runs-on: ubuntu-latest
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permissions:
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packages: write
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contents: read
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id-token: write
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steps:
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- name: Check out the repo
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uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
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with:
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persist-credentials: false
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- name: Set up QEMU
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uses: docker/setup-qemu-action@96fe6ef7f33517b61c61be40b68a1882f3264fb8 # v4.2.0
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with:
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platforms: linux/amd64,linux/arm64
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- name: Set up Docker Buildx
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uses: docker/setup-buildx-action@bb05f3f5519dd87d3ba754cc423b652a5edd6d2c # v4.2.0
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- name: Log in to the Container registry
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uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f
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with:
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registry: ghcr.io
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Extract metadata (tags, labels) for Docker
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id: meta
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uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302
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with:
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images: ghcr.io/${{ github.repository }}
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- uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 # v4.1.2
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- name: Build and push Docker image
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id: build
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uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a
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with:
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context: .
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platforms: linux/amd64,linux/arm64
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push: true
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tags: ${{ steps.meta.outputs.tags }}
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labels: ${{ steps.meta.outputs.labels }}
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provenance: mode=max
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sbom: true
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- name: Sign image by digest
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env:
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DIGEST: ${{ steps.build.outputs.digest }}
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IMAGE: ghcr.io/${{ github.repository }}
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run: |
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set -euo pipefail
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[[ "$DIGEST" =~ ^sha256:[0-9a-f]{64}$ ]]
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cosign sign --yes "${IMAGE}@${DIGEST}"
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- name: Verify BuildKit attestations and extract SPDX predicates
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env:
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DIGEST: ${{ steps.build.outputs.digest }}
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IMAGE: ghcr.io/${{ github.repository }}
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run: |
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set -euo pipefail
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reference="${IMAGE}@${DIGEST}"
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docker buildx imagetools inspect "$reference" --format '{{ json .Provenance }}' > provenance.json
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docker buildx imagetools inspect "$reference" --format '{{ json .SBOM }}' > sbom.json
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for platform in linux/amd64 linux/arm64; do
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jq -e --arg p "$platform" '.[$p].SLSA | type == "object" and length > 0' \
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provenance.json >/dev/null
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jq -e --arg p "$platform" '.[$p].SPDX' sbom.json > "sbom-${platform//\//-}.spdx.json"
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done
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- name: Attest platform SBOMs by digest
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env:
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DIGEST: ${{ steps.build.outputs.digest }}
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IMAGE: ghcr.io/${{ github.repository }}
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run: |
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set -euo pipefail
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[[ "$DIGEST" =~ ^sha256:[0-9a-f]{64}$ ]]
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reference="${IMAGE}@${DIGEST}"
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for predicate in sbom-linux-amd64.spdx.json sbom-linux-arm64.spdx.json; do
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cosign attest --yes --type spdxjson --predicate "$predicate" "$reference"
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done
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