fix(ci): isolate s3 compat temp file paths

.github/workflows/rustfs-s3-compat-test.yml

@@ -49,6 +49,18 @@ jobs:
           persist-credentials: false
           token: ${{ secrets.PF_TESTING_GH_TOKEN }}
 
+      - name: Patch auto-testing temp file paths
+        run: |
+          set -euo pipefail
+          # Use per-run TEST_TMP files instead of shared /tmp/s3c-* paths.
+          # This prevents permission collisions from stale files created by
+          # previous jobs/users on shared self-hosted runners.
+          perl -0pi -e 's#/tmp/(s3c-[A-Za-z0-9._-]+)#\$\{TEST_TMP\}/$1#g' auto-testing/rustfs-s3-compat-test.sh
+          if grep -nE '/tmp/s3c-[A-Za-z0-9._-]+' auto-testing/rustfs-s3-compat-test.sh; then
+            echo "unexpected hardcoded /tmp/s3c-* path(s) remain"
+            exit 1
+          fi
+
       - name: Show environment
         run: |
           uname -a