[AMD CI] fix sglang version detection in daily docker image release and init container (#16367)

https://github.com/sgl-project/sglang/actions/runs/20711245259/job/59453869006?pr=16367 to be fixed in https://github.com/sgl-project/sglang/pull/15663

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

@@ -25,11 +25,27 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Required for git describe to find tags
 
       - name: "Set Date"
         run: |
           echo "DATE=$(date +%Y%m%d)" >> $GITHUB_ENV
 
+      - name: Get version from latest tag
+        id: version
+        run: |
+          # Get the latest version tag sorted by version number (e.g., v0.5.7 -> 0.5.7)
+          VERSION=$(git tag -l 'v[0-9]*' --sort=-v:refname | head -1 | sed 's/^v//')
+
+          if [ -z "$VERSION" ]; then
+            echo "::error::Could not determine version from git tags"
+            exit 1
+          fi
+
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "Detected version: ${VERSION}"
+
       - name: Login to Docker Hub
         uses: docker/login-action@v2
         with:
@@ -38,7 +54,7 @@ jobs:
 
       - name: Build and Push
         run: |
-          version=$(cat python/sglang/version.py | cut -d'"' -f2)
+          version=${{ steps.version.outputs.version }}
           echo "Version: ${version}"
 
           if [ "${{ matrix.gpu_arch }}" = "gfx942" ]; then
@@ -70,11 +86,27 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Required for git describe to find tags
 
       - name: "Set Date"
         run: |
           echo "DATE=$(date +%Y%m%d)" >> $GITHUB_ENV
 
+      - name: Get version from latest tag
+        id: version
+        run: |
+          # Get the latest version tag sorted by version number (e.g., v0.5.7 -> 0.5.7)
+          VERSION=$(git tag -l 'v[0-9]*' --sort=-v:refname | head -1 | sed 's/^v//')
+
+          if [ -z "$VERSION" ]; then
+            echo "::error::Could not determine version from git tags"
+            exit 1
+          fi
+
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "Detected version: ${VERSION}"
+
       - name: Login to Docker Hub
         uses: docker/login-action@v2
         with:
@@ -85,7 +117,7 @@ jobs:
         run: |
           set -euxo pipefail
 
-          version=$(cat python/sglang/version.py | cut -d'"' -f2)
+          version=${{ steps.version.outputs.version }}
           echo "Version: ${version}"
 
           if [ "${{ matrix.gpu_arch }}" = "gfx942" ]; then