Merge pull request ClickHouse#39898 from pkit/pkit/fix_mkdir_nfs

fix broken NFS mkdir introduced in ClickHouse#36341

docker/server/entrypoint.sh

@@ -57,7 +57,15 @@ do
     # check if variable not empty
     [ -z "$dir" ] && continue
     # ensure directories exist
-    if ! mkdir -p "$dir"; then
+    if [ "$DO_CHOWN" = "1" ]; then
+        mkdir="mkdir"
+    else
+        # if DO_CHOWN=0 it means that the system does not map root user to "admin" permissions
+        # it mainly happens on NFS mounts where root==nobody for security reasons
+        # thus mkdir MUST run with user id/gid and not from nobody that has zero permissions
+        mkdir="/usr/bin/clickhouse su "${USER}:${GROUP}" mkdir"
+    fi
+    if ! $mkdir -p "$dir"; then
         echo "Couldn't create necessary directory: $dir"
         exit 1
     fi