[CI] Fix nightly docker builds failing on root-owned workspace leftovers (#23279)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -20,6 +20,9 @@ jobs:
     if: github.repository == 'sgl-project/sglang'
     runs-on: x64-docker-build-node
     steps:
+      - name: Cleanup workspace (remove root-owned files from prior runs)
+        run: sudo rm -rf "$GITHUB_WORKSPACE"/* || true
+
       - name: Checkout repository
         uses: actions/checkout@v4
         with:

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

@@ -53,6 +53,9 @@ jobs:
       - name: Delete huge unnecessary tools folder
         run: rm -rf /opt/hostedtoolcache
 
+      - name: Cleanup workspace (remove root-owned files from prior runs)
+        run: sudo rm -rf "$GITHUB_WORKSPACE"/* || true
+
       - name: Checkout repository
         uses: actions/checkout@v4
         with:

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

@@ -32,6 +32,9 @@ jobs:
       - name: Delete huge unnecessary tools folder
         run: rm -rf /opt/hostedtoolcache
 
+      - name: Cleanup workspace (remove root-owned files from prior runs)
+        run: sudo rm -rf "$GITHUB_WORKSPACE"/* || true
+
       - name: Checkout repository
         uses: actions/checkout@v4
 
@@ -140,6 +143,9 @@ jobs:
       - name: Delete huge unnecessary tools folder
         run: rm -rf /opt/hostedtoolcache
 
+      - name: Cleanup workspace (remove root-owned files from prior runs)
+        run: sudo rm -rf "$GITHUB_WORKSPACE"/* || true
+
       - name: Checkout repository
         uses: actions/checkout@v4
 

.github/workflows/release-docker.yml

@@ -32,6 +32,9 @@ jobs:
       - name: Delete huge unnecessary tools folder
         run: rm -rf /opt/hostedtoolcache
 
+      - name: Cleanup workspace (remove root-owned files from prior runs)
+        run: sudo rm -rf "$GITHUB_WORKSPACE"/* || true
+
       - name: Checkout repository
         uses: actions/checkout@v4
 
@@ -140,6 +143,9 @@ jobs:
       - name: Delete huge unnecessary tools folder
         run: rm -rf /opt/hostedtoolcache
 
+      - name: Cleanup workspace (remove root-owned files from prior runs)
+        run: sudo rm -rf "$GITHUB_WORKSPACE"/* || true
+
       - name: Checkout repository
         uses: actions/checkout@v4
 

.github/workflows/trivy-scan-dev.yml

@@ -24,6 +24,9 @@ jobs:
       matrix:
         tag: ${{ inputs.tag && fromJSON(format('["{0}"]', inputs.tag)) || fromJSON('["dev", "dev-cu13"]') }}
     steps:
+      - name: Cleanup workspace (remove root-owned files from prior runs)
+        run: sudo rm -rf "$GITHUB_WORKSPACE"/* || true
+
       - name: Checkout repository
         uses: actions/checkout@v4