[CI] Replace upload/download-artifact with job outputs in release-docker workflow (#21579)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/release-docker.yml

@@ -18,6 +18,9 @@ jobs:
   publish-x86:
     if: github.repository == 'sgl-project/sglang'
     environment: "prod"
+    outputs:
+      digest-cu129: ${{ steps.build-cu129.outputs.digest }}
+      digest-cu130: ${{ steps.build-cu130.outputs.digest }}
     strategy:
       matrix:
         variant:
@@ -75,6 +78,7 @@ jobs:
           echo "version=${VERSION}" >> $GITHUB_OUTPUT
 
       - name: Build AMD64 Framework
+        id: build-cu129
         run: |
           version=${{ steps.version.outputs.version }}
 
@@ -94,9 +98,10 @@ jobs:
 
           DIGEST=$(python3 -c "import json; print(json.load(open('/tmp/metadata-cu129-framework.json'))['containerimage.digest'])")
           echo "Pushed digest: ${DIGEST}"
-          echo "${DIGEST}" > /tmp/digest-cu129-amd64-framework.txt
+          echo "digest=${DIGEST}" >> $GITHUB_OUTPUT
 
       - name: Build and Push AMD64 Framework (CUDA 13)
+        id: build-cu130
         run: |
           version=${{ steps.version.outputs.version }}
 
@@ -116,18 +121,14 @@ jobs:
 
           DIGEST=$(python3 -c "import json; print(json.load(open('/tmp/metadata-cu130-framework.json'))['containerimage.digest'])")
           echo "Pushed digest: ${DIGEST}"
-          echo "${DIGEST}" > /tmp/digest-cu130-amd64-framework.txt
+          echo "digest=${DIGEST}" >> $GITHUB_OUTPUT
-
-      - name: Upload digests
-        uses: actions/upload-artifact@v4
-        with:
-          name: digests-amd64
-          path: /tmp/digest-*.txt
-          retention-days: 1
 
   publish-arm64:
     if: github.repository == 'sgl-project/sglang'
     environment: "prod"
+    outputs:
+      digest-cu129: ${{ steps.build-cu129.outputs.digest }}
+      digest-cu130: ${{ steps.build-cu130.outputs.digest }}
     strategy:
       matrix:
         variant:
@@ -174,6 +175,7 @@ jobs:
           echo "version=${VERSION}" >> $GITHUB_OUTPUT
 
       - name: Build ARM64 Framework
+        id: build-cu129
         run: |
           version=${{ steps.version.outputs.version }}
 
@@ -193,9 +195,10 @@ jobs:
 
           DIGEST=$(python3 -c "import json; print(json.load(open('/tmp/metadata-cu129-framework.json'))['containerimage.digest'])")
           echo "Pushed digest: ${DIGEST}"
-          echo "${DIGEST}" > /tmp/digest-cu129-arm64-framework.txt
+          echo "digest=${DIGEST}" >> $GITHUB_OUTPUT
 
       - name: Build and Push ARM64 Framework (CUDA 13)
+        id: build-cu130
         run: |
           version=${{ steps.version.outputs.version }}
 
@@ -215,14 +218,7 @@ jobs:
 
           DIGEST=$(python3 -c "import json; print(json.load(open('/tmp/metadata-cu130-framework.json'))['containerimage.digest'])")
           echo "Pushed digest: ${DIGEST}"
-          echo "${DIGEST}" > /tmp/digest-cu130-arm64-framework.txt
+          echo "digest=${DIGEST}" >> $GITHUB_OUTPUT
-
-      - name: Upload digests
-        uses: actions/upload-artifact@v4
-        with:
-          name: digests-arm64
-          path: /tmp/digest-*.txt
-          retention-days: 1
 
   create-manifests:
     runs-on: ubuntu-22.04
@@ -264,26 +260,14 @@ jobs:
 
           echo "version=${VERSION}" >> $GITHUB_OUTPUT
 
-      - name: Download amd64 digests
-        uses: actions/download-artifact@v4
-        with:
-          name: digests-amd64
-          path: /tmp/digests/amd64
-
-      - name: Download arm64 digests
-        uses: actions/download-artifact@v4
-        with:
-          name: digests-arm64
-          path: /tmp/digests/arm64
-
       - name: Create multi-arch manifests
         run: |
           version=${{ steps.version.outputs.version }}
 
-          CU129_AMD64_FW=$(cat /tmp/digests/amd64/digest-cu129-amd64-framework.txt)
+          CU129_AMD64_FW=${{ needs.publish-x86.outputs.digest-cu129 }}
-          CU130_AMD64_FW=$(cat /tmp/digests/amd64/digest-cu130-amd64-framework.txt)
+          CU130_AMD64_FW=${{ needs.publish-x86.outputs.digest-cu130 }}
-          CU129_ARM64_FW=$(cat /tmp/digests/arm64/digest-cu129-arm64-framework.txt)
+          CU129_ARM64_FW=${{ needs.publish-arm64.outputs.digest-cu129 }}
-          CU130_ARM64_FW=$(cat /tmp/digests/arm64/digest-cu130-arm64-framework.txt)
+          CU130_ARM64_FW=${{ needs.publish-arm64.outputs.digest-cu130 }}
 
           # Create versioned framework manifest (default)
           docker buildx imagetools create \