[Bug] Dockerfile_aarch64_ascend cannot work for docker 18.09

[bingps]

Checklist

• 1. I have searched related issues but cannot get the expected help.
• 2. The bug has not been fixed in the latest version.
• 3. Please note that if the bug-related issue you submitted lacks corresponding environment info and a minimal reproducible demo, it will be challenging for us to reproduce and resolve the issue, reducing the likelihood of receiving feedback.

Describe the bug

The Dockerfile_aarch64_ascend cannot work for docker 18.09, which is the suggested version of the document, the error is like

DOCKER_BUILDKIT=1 docker build -t lmdeploy-aarch64-ascend:latest -f docker/Dockerfile_aarch64_ascend .      
[+] Building 0.0s (2/2) FINISHED
 => [internal] load build definition from Dockerfile_aarch64_ascend                                                                              0.0s
 => => transferring dockerfile: 112B                                                                                                             0.0s
 => [internal] load .dockerignore                                                                                                                0.0s
 => => transferring context: 2B                                                                                                                  0.0s
failed to create LLB definition: Dockerfile parse error line 39: Unknown flag: mount

According to this answer, it seems that older docker needs add # syntax=docker/dockerfile:experimental in Dockerfile. However, after adding this line the error is like

[+] Building 1.1s (4/4) FINISHED
 => [internal] load .dockerignore                                                                                                                0.0s
 => => transferring context: 2B                                                                                                                  0.0s
 => [internal] load build definition from Dockerfile_aarch64_ascend                                                                              0.0s
 => => transferring dockerfile: 112B                                                                                                             0.0s
 => resolve image config for docker.io/docker/dockerfile:experimental                                                                            0.0s
 => docker-image://docker.io/docker/dockerfile:experimental                                                                                      0.0s
 => => resolve docker.io/docker/dockerfile:experimental                                                                                          0.0s
exit code: 1

My current solution is to upgrade docker to newer versions, which is not that easy on Atlas servers due to incompatibility bewteen OpenEuler and docker😢 Is there better solutions like modifying the Dockerfile?

Reproduction

DOCKER_BUILDKIT=1 docker build -t lmdeploy-aarch64-ascend:latest -f docker/Dockerfile_aarch64_ascend .

Environment

N/A

Error traceback