[CI] Add nightly builds to dockerhub (#9804)

Signed-off-by: Sahithi Chigurupati <chigurupati.sahithi@gmail.com>

.github/workflows/release-docker-dev.yml

@@ -72,5 +72,34 @@ jobs:
       - run: |
           docker buildx imagetools create \
             -t lmsysorg/sglang:${{ matrix.variant.tag }} \
+            -t lmsysorg/sglang:nightly-${{ matrix.variant.tag }}-${{ github.sha }} \
             lmsysorg/sglang:${{ matrix.variant.x86_tag }} \
             lmsysorg/sglang:${{ matrix.variant.arm64_tag }}
+      - name: Cleanup Old Nightly Builds
+        run: |
+          # Get JWT token for Docker Hub API
+          TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "${{ secrets.DOCKERHUB_USERNAME }}", "password": "${{ secrets.DOCKERHUB_TOKEN }}"}' https://hub.docker.com/v2/users/login/ | jq -r .token)
+
+          # Get all tags for the repository
+          TAGS_RESPONSE=$(curl -s -H "Authorization: JWT $TOKEN" "https://hub.docker.com/v2/repositories/lmsysorg/sglang/tags/?page_size=100")
+
+          # Extract tags that match our pattern and sort by last_updated timestamp (most recent first)
+          TAGS=$(echo "$TAGS_RESPONSE" | jq -r '.results[] | select(.name | startswith("nightly-${{ matrix.variant.tag }}-")) | "\(.last_updated)|\(.name)"' | sort -r | cut -d'|' -f2)
+
+          # Count total tags and keep only the 14 most recent
+          TAG_COUNT=$(echo "$TAGS" | wc -l)
+          if [ "$TAG_COUNT" -gt 14 ]; then
+            echo "Found $TAG_COUNT nightly builds, keeping only the 14 most recent"
+            TAGS_TO_DELETE=$(echo "$TAGS" | tail -n +15)
+            echo "Tags to delete: $TAGS_TO_DELETE"
+
+            # Delete old tags
+            for tag in $TAGS_TO_DELETE; do
+              echo "Deleting tag: $tag"
+              curl -X DELETE \
+                -H "Authorization: JWT $TOKEN" \
+                "https://hub.docker.com/v2/repositories/lmsysorg/sglang/tags/$tag/"
+            done
+          else
+            echo "Only $TAG_COUNT nightly builds found, no cleanup needed"
+          fi