[AMD-miles] Bump miles rocm700-mi35x base image and migrate nightly test onto it (#30587)

.github/workflows/nightly-test-amd-miles-rocm700.yml

@@ -1,4 +1,4 @@
-name: Nightly Test Miles (AMD ROCm 7.2)
+name: Nightly Test Miles (AMD ROCm 7.0)
 
 on:
   schedule:
@@ -7,7 +7,7 @@ on:
   workflow_dispatch:
     inputs:
       image_tag:
-        description: "Override miles image tag (e.g. miles-rocm720-mi35x-20260621); empty = newest by date"
+        description: "Override miles image tag (e.g. miles-rocm700-mi35x-20260621); empty = newest by date"
         required: false
         type: string
         default: ""
@@ -46,10 +46,10 @@ jobs:
           username: ${{ secrets.DOCKERHUB_AMD_USERNAME }}
           password: ${{ secrets.DOCKERHUB_AMD_TOKEN }}
 
-      - name: Resolve newest miles ROCm 7.2 image
+      - name: Resolve newest miles ROCm 7.0 image
         run: |
           repo="rocm/sgl-dev"
-          base="miles-rocm720-mi35x"
+          base="miles-rocm700-mi35x"
           tag="${{ inputs.image_tag }}"
           if [ -z "${tag}" ]; then
             # Walk back from today; the build job pushes a dated tag at 12:00 UTC.

.github/workflows/release-docker-amd-miles-rocm700-nightly.yml

@@ -20,7 +20,8 @@ jobs:
         include:
           - gpu_arch: gfx950
             rocm_tag: rocm700-mi35x
-            sglang_image_tag: v0.5.10-rocm700-mi35x
+            sglang_image_repo: rocm/sgl-dev
+            sglang_image_tag: v0.5.14-rocm700-mi35x-20260627
           - gpu_arch: gfx942
             rocm_tag: rocm700-mi30x
             sglang_image_tag: v0.5.10-rocm700-mi30x
@@ -54,6 +55,7 @@ jobs:
           docker build . \
             -f docker/Dockerfile.rocm \
             --build-arg GPU_ARCH=${{ matrix.gpu_arch }} \
+            --build-arg SGLANG_IMAGE_REPO=${{ matrix.sglang_image_repo || 'lmsysorg/sglang' }} \
             --build-arg SGLANG_IMAGE_TAG=${{ matrix.sglang_image_tag }} \
             --build-arg MILES_COMMIT=${{ steps.miles.outputs.sha }} \
             -t rocm/sgl-dev:${dated} \