[action] cosign over docker image digest

.github/workflows/release.yml

@@ -15,8 +15,12 @@ jobs:
     name: Create Release
     needs: ci
     runs-on: ubuntu-latest
+    env:
+      DOCKER_IMAGE: smallstep/step-ca
     outputs:
+      version: ${{ steps.extract-tag.outputs.VERSION }}
       is_prerelease: ${{ steps.is_prerelease.outputs.IS_PRERELEASE }}
+      docker_tags: ${{ env.DOCKER_TAGS }}
     steps:
       - name: Is Pre-release
         id: is_prerelease
@@ -26,6 +30,16 @@ jobs:
           OUT=$?
           if [ $OUT -eq 0 ]; then IS_PRERELEASE=true; else IS_PRERELEASE=false; fi
           echo "IS_PRERELEASE=${IS_PRERELEASE}" >> ${GITHUB_OUTPUT}
+      - name: Extract Tag Names
+        id: extract-tag
+        run: |
+          VERSION=${GITHUB_REF#refs/tags/v}
+          echo "VERSION=${VERSION}" >> ${GITHUB_OUTPUT}
+          echo "DOCKER_TAGS=${{ env.DOCKER_IMAGE }}:${VERSION}" >> ${GITHUB_ENV}
+      - name: Add Latest Tag
+        if: steps.is_prerelease.outputs.IS_PRERELEASE == 'false'
+        run: |
+          echo "DOCKER_TAGS=${{ env.DOCKER_TAGS }},${{ env.DOCKER_IMAGE }}:latest" >> ${GITHUB_ENV}
       - name: Create Release
         id: create_release
         uses: actions/create-release@v1
@@ -68,34 +82,19 @@ jobs:
           args: release --rm-dist
         env:
           GITHUB_TOKEN: ${{ secrets.GORELEASER_PAT }}
-          RELEASE_DATE: ${RELEASE_DATE}
+          RELEASE_DATE: ${{ env.RELEASE_DATE }}
           COSIGN_EXPERIMENTAL: 1
 
   build_upload_docker:
     name: Build & Upload Docker Images
-    runs-on: ubuntu-latest
-    needs: ci
+    needs: create_release
     permissions:
       id-token: write
       contents: write
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Setup Go
-        uses: actions/setup-go@v3
-        with:
-          go-version: '1.19'
-          check-latest: true
-      - name: Install cosign
-        uses: sigstore/cosign-installer@v2
-        with:
-          cosign-release: 'v1.13.1'
-      - name: Build
-        id: build
-        run: |
-          PATH=$PATH:/usr/local/go/bin:/home/admin/go/bin
-          make docker-artifacts
-        env:
-          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
-          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
-          COSIGN_EXPERIMENTAL: 1
+    uses: smallstep/workflows/.github/workflows/docker-buildx-push.yml@main
+    with:
+      platforms: linux/amd64,linux/386,linux/arm,linux/arm64
+      tags: ${{ needs.create_release.outputs.docker_tags }}
+      docker_image: smallstep/step-ca
+      docker_file: docker/Dockerfile.step-ca
+    secrets: inherit