docker release: copy and sign the digest the run created, pin the rest

crane copy and the signature both resolved the tag, which another
publisher could move between the two steps. The index digest is read once,
right after it is created, and the Docker Hub copy and both signatures use
it. The manual latest rebuild gets the same treatment. The actions in these
jobs are pinned to commits, crane to v0.22.0 by checksum, and the sparse
checkout no longer keeps the token.

Claude-Session: https://claude.ai/code/session_01A5zMqzaUg1Snur4Yg8xJGa

.github/workflows/container_release_unified.yml

@@ -318,10 +318,11 @@ jobs:
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           sparse-checkout: .github/actions
+          persist-credentials: false
 
       - name: Download digests
         if: github.event_name != 'workflow_dispatch' || github.event.inputs.variant == 'all' || github.event.inputs.variant == matrix.variant
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           pattern: digest-${{ matrix.variant }}-*
           merge-multiple: true
@@ -329,11 +330,11 @@ jobs:
 
       - name: Set up Docker Buildx
         if: github.event_name != 'workflow_dispatch' || github.event.inputs.variant == 'all' || github.event.inputs.variant == matrix.variant
-        uses: docker/setup-buildx-action@v4
+        uses: docker/setup-buildx-action@37fe631027851001ddb9b187196cc803df7f5f0e # v4
 
       - name: Login to GHCR
         if: github.event_name != 'workflow_dispatch' || github.event.inputs.variant == 'all' || github.event.inputs.variant == matrix.variant
-        uses: docker/login-action@v4.6.0
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
         with:
           registry: ghcr.io
           username: ${{ secrets.GHCR_USERNAME }}
@@ -341,16 +342,19 @@ jobs:
 
       - name: Create multi-arch tag on GHCR
         if: github.event_name != 'workflow_dispatch' || github.event.inputs.variant == 'all' || github.event.inputs.variant == matrix.variant
+        id: manifest
         working-directory: /tmp/digests
         run: |
           docker buildx imagetools create \
             -t ${{ env.IMAGE }}:${{ env.RELEASE_TAG }}${{ matrix.tag_suffix }} \
             $(printf '${{ env.IMAGE }}@sha256:%s ' *)
           docker buildx imagetools inspect ${{ env.IMAGE }}:${{ env.RELEASE_TAG }}${{ matrix.tag_suffix }}
+          # The copy and the signature below use this digest, not whatever the tag points at by then.
+          echo "digest=$(docker buildx imagetools inspect --format '{{.Manifest.Digest}}' ${{ env.IMAGE }}:${{ env.RELEASE_TAG }}${{ matrix.tag_suffix }})" >> "$GITHUB_OUTPUT"
 
       - name: Login to Docker Hub
         if: github.event_name != 'workflow_dispatch' || github.event.inputs.variant == 'all' || github.event.inputs.variant == matrix.variant
-        uses: docker/login-action@v4.6.0
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
@@ -359,7 +363,9 @@ jobs:
         if: github.event_name != 'workflow_dispatch' || github.event.inputs.variant == 'all' || github.event.inputs.variant == matrix.variant
         run: |
           cd $(mktemp -d)
-          curl -sL "https://github.com/google/go-containerregistry/releases/latest/download/go-containerregistry_Linux_x86_64.tar.gz" | tar xz
+          curl -sLO https://github.com/google/go-containerregistry/releases/download/v0.22.0/go-containerregistry_Linux_x86_64.tar.gz
+          echo "edb74d53fad9a596860f59d1c5d04a43dfb5f441dc71f57060dd0bf39483c833  go-containerregistry_Linux_x86_64.tar.gz" | sha256sum -c -
+          tar xzf go-containerregistry_Linux_x86_64.tar.gz crane
           sudo mv crane /usr/local/bin/
           crane version
 
@@ -390,22 +396,17 @@ jobs:
 
           echo "Copying ${{ matrix.variant }} from GHCR to Docker Hub..."
           retry_with_backoff crane copy \
-            ${{ env.IMAGE }}:${{ env.RELEASE_TAG }}${{ matrix.tag_suffix }} \
+            ${{ env.IMAGE }}@${{ steps.manifest.outputs.digest }} \
             chrislusf/seaweedfs:${{ env.RELEASE_TAG }}${{ matrix.tag_suffix }}
           echo "Copied ${{ matrix.variant }} to Docker Hub"
 
-      - name: Resolve the published digests
-        if: github.event_name != 'workflow_dispatch' || github.event.inputs.variant == 'all' || github.event.inputs.variant == matrix.variant
-        id: digests
-        run: |
-          tag="${RELEASE_TAG}${{ matrix.tag_suffix }}"
-          echo "images=${IMAGE}@$(crane digest "${IMAGE}:${tag}") chrislusf/seaweedfs@$(crane digest "chrislusf/seaweedfs:${tag}")" >> "$GITHUB_OUTPUT"
-
       - name: Sign ${{ matrix.variant }}
         if: github.event_name != 'workflow_dispatch' || github.event.inputs.variant == 'all' || github.event.inputs.variant == matrix.variant
         uses: ./.github/actions/sign-image
         with:
-          images: ${{ steps.digests.outputs.images }}
+          images: >-
+            ${{ env.IMAGE }}@${{ steps.manifest.outputs.digest }}
+            chrislusf/seaweedfs@${{ steps.manifest.outputs.digest }}
 
   # Report-only trivy scan: uploads fixable HIGH/CRITICAL findings to GitHub
   # Security for visibility, but never blocks the release. Releases (including
@@ -492,7 +493,9 @@ jobs:
       - name: Install crane
         run: |
           cd $(mktemp -d)
-          curl -sL "https://github.com/google/go-containerregistry/releases/latest/download/go-containerregistry_Linux_x86_64.tar.gz" | tar xz
+          curl -sLO https://github.com/google/go-containerregistry/releases/download/v0.22.0/go-containerregistry_Linux_x86_64.tar.gz
+          echo "edb74d53fad9a596860f59d1c5d04a43dfb5f441dc71f57060dd0bf39483c833  go-containerregistry_Linux_x86_64.tar.gz" | sha256sum -c -
+          tar xzf go-containerregistry_Linux_x86_64.tar.gz crane
           sudo mv crane /usr/local/bin/
           crane version