github: Replace cosign with attest-build-provenance

Update `docker-push.yml` to use artifact attestation for images. Replace
`cosign` with `attest-build-provenance` since it's no longer the
recommended way. This new build workflow follows the guidelines [1] and
[2], and is a combination of them:

[1] https://docs.github.com/en/actions/use-cases-and-examples/publishing-packages/publishing-docker-images
[2] https://github.com/docker/build-push-action?tab=readme-ov-file#git-context

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

.github/workflows/docker-publish.yml

@@ -23,34 +23,21 @@ jobs:
 
     runs-on: ubuntu-latest
     permissions:
-      contents: read
       packages: write
-      # This is used to complete the identity challenge
-      # with sigstore/fulcio when running outside of PRs.
+      contents: read
+      attestations: write
       id-token: write
 
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v3
-
-      # Install the cosign tool except on PR
-      # https://github.com/sigstore/cosign-installer
-      - name: Install cosign
-        if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@v3.1.1
-      - name: Check install!
-        if: github.event_name != 'pull_request'
-        run: cosign version
-
-      # Workaround: https://github.com/docker/build-push-action/issues/461
-      - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf
-
-      # Login against a Docker registry except on PR
-      # https://github.com/docker/login-action
-      - name: Log into registry ${{ env.REGISTRY }}
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        if: ${{ github.event_name != 'pull_request' }}
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_ACCOUNT_ID }}
           password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
@@ -63,61 +50,47 @@ jobs:
           echo "VERSION=${NEXT_VERSION}" >> $GITHUB_ENV
           echo "Next version to be published is: ${NEXT_VERSION}"
 
-      # Build and push Docker image with Buildx (don't push on PR)
-      # https://github.com/docker/build-push-action
       - name: Build and push Docker image
         id: build-and-push
-        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
+        uses: docker/build-push-action@v6
         with:
           context: .
+          file: Dockerfile
           push: ${{ github.event_name != 'pull_request' }}
           # This is needed so that a manifest is created, and we can have the same
           # docker container on both x86_64 and arm64.
           platforms: linux/amd64,linux/arm64
           tags: ${{ env.VERSION }}
-          labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
 
-      # Sign the resulting Docker image digest except on PRs.
-      # This will only write to the public Rekor transparency log when the Docker
-      # repository is public to avoid leaking data.  If you would like to publish
-      # transparency data even for private images, pass --force to cosign below.
-      # https://github.com/sigstore/cosign
-      - name: Sign the published Docker image
+      - name: Generate artifact attestation
         if: ${{ github.event_name != 'pull_request' }}
-        env:
-          COSIGN_EXPERIMENTAL: "true"
-        # This step uses the identity token to provision an ephemeral certificate
-        # against the sigstore community Fulcio instance.
-        run: |
-          echo "${{ steps.meta.outputs.tags }}" | xargs -I {} cosign sign {}@${{ steps.build-and-push.outputs.digest }}
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.VERSION }}
+          subject-digest: ${{ steps.build-and-push.outputs.digest }}
+          push-to-registry: true
 
-  build-riscv64:
+  build-riscv:
 
     runs-on: ubuntu-latest
     permissions:
-      contents: read
       packages: write
+      contents: read
+      attestations: write
       id-token: write
 
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v3
-
-      - name: Install cosign
-        if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@v3.1.1
-      - name: Check install!
-        if: github.event_name != 'pull_request'
-        run: cosign version
-
-      - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf
-
-      - name: Log into registry ${{ env.REGISTRY }}
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        if: ${{ github.event_name != 'pull_request' }}
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_ACCOUNT_ID }}
           password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
@@ -128,22 +101,22 @@ jobs:
           echo "VERSION=${NEXT_VERSION}" >> $GITHUB_ENV
           echo "Next version to be published is: ${NEXT_VERSION}"
 
-      - name: Build and push Docker image for riscv64
-        id: build-and-push-riscv64
-        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
+      - name: Build and push Docker image for RISC-V
+        id: build-and-push-riscv
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: Dockerfile.riscv64
           push: ${{ github.event_name != 'pull_request' }}
           platforms: linux/amd64
           tags: ${{ env.VERSION }}-riscv
-          labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
 
-      - name: Sign the published Docker image
+      - name: Generate artifact attestation
         if: ${{ github.event_name != 'pull_request' }}
-        env:
-          COSIGN_EXPERIMENTAL: "true"
-        run: |
-          echo "${{ steps.meta.outputs.tags }}-riscv" | xargs -I {} cosign sign {}@${{ steps.build-and-push-riscv.outputs.digest }}
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.VERSION }}-riscv
+          subject-digest: ${{ steps.build-and-push-riscv.outputs.digest }}
+          push-to-registry: true