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Sign published container images #227

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29 changes: 29 additions & 0 deletions .github/workflows/publish.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -18,12 +18,15 @@ jobs:
permissions:
packages: write
contents: read
id-token: write
steps:
- name: Check out the repo
uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
with:
persist-credentials: false

- uses: docker/setup-buildx-action@bb05f3f5519dd87d3ba754cc423b652a5edd6d2c # v4.2.0

- name: Log in to the Container registry
uses: docker/login-action@06fb636fac595d6fb4b28a5dfcb21a6f5091859c
with:
Expand All @@ -37,10 +40,36 @@ jobs:
with:
images: ghcr.io/${{ github.repository }}

- uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 # v4.1.2

- name: Build and push Docker image
id: build
uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a
with:
context: .
push: true
tags: ${{ steps.meta.outputs.tags }}
labels: ${{ steps.meta.outputs.labels }}
provenance: mode=max
sbom: true

- name: Sign image by digest
env:
DIGEST: ${{ steps.build.outputs.digest }}
IMAGE: ghcr.io/${{ github.repository }}
run: |
set -euo pipefail
[[ "$DIGEST" =~ ^sha256:[0-9a-f]{64}$ ]]
cosign sign --yes "${IMAGE}@${DIGEST}"

- name: Verify remote provenance and SBOM attestations
env:
DIGEST: ${{ steps.build.outputs.digest }}
IMAGE: ghcr.io/${{ github.repository }}
run: |
set -euo pipefail
reference="${IMAGE}@${DIGEST}"
docker buildx imagetools inspect "$reference" --format '{{ json .Provenance }}' \
| jq -e 'type == "object" and length > 0' >/dev/null
docker buildx imagetools inspect "$reference" --format '{{ json .SBOM }}' \
| jq -e 'type == "object" and length > 0' >/dev/null