Merge pull request #14 from github/fetch-digest-with-crane

Use crane to fetch OCI image digest

.github/workflows/release.yml

@@ -39,12 +39,11 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Push packaged chart to GHCR
         run: helm push ${{ github.ref_name }}.tgz oci://${{ env.REGISTRY }}/${{ github.repository }}
+      - uses: imjasonh/setup-crane@00c9e93efa4e1138c9a7a5c594acd6c75a2fbf0c # v0.3
       - name: Get pushed chart digest
         id: get-digest
         run: |
-          # helm show chart prints the digest to stderr, so redirect stderr and
-          # extract the digest from the output
-          digest=$(helm show chart oci://${{ env.REGISTRY }}/${{ github.repository }}/${{ steps.release-details.outputs.chart_name }} --version ${{ steps.release-details.outputs.chart_version }} 2>&1 | grep "^Digest" | sed 's/^Digest: //')
+          digest=$(crane digest ${{ env.REGISTRY }}/${{ env.repository }}/${{ steps.release-details.outputs.chart_name }}:${{ steps.release-details.outputs.chart_version }})
           echo digest=$digest >> $GITHUB_OUTPUT
       - name: Attest
         uses: actions/attest-build-provenance@173725a1209d09b31f9d30a3890cf2757ebbff0d # v1.1.2