Minor: improve sampler & remove unused fields from model_config.py (#11531)

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

@@ -65,6 +65,7 @@ jobs:
             arm64_tag: dev-arm64
     steps:
       - uses: docker/setup-buildx-action@v3
+
       - uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -72,9 +73,10 @@ jobs:
       - run: |
           docker buildx imagetools create \
             -t lmsysorg/sglang:${{ matrix.variant.tag }} \
-            -t lmsysorg/sglang:nightly-${{ matrix.variant.tag }}-${{ github.sha }} \
+            -t lmsysorg/sglang:nightly-${{ matrix.variant.tag }}-$(date +%Y%m%d)-${{ github.sha:0:8 }} \
             lmsysorg/sglang:${{ matrix.variant.x86_tag }} \
             lmsysorg/sglang:${{ matrix.variant.arm64_tag }}
+
       - name: Cleanup Old Nightly Builds
         run: |
           # Get JWT token for Docker Hub API