the tidb will be in unhealthy status when create tidb node in an 1 cpu node

[seiya-annie]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. edit testbed config as:

         tidb:
             replicas: 1
             baseImage: hub-new.pingcap.net/qa/tidb
#              version: v6.0.0-pre
             requests:
                 cpu: 1000m
                 memory: 2Gi
             limits:
                 cpu: 1000m
                 memory: 4Gi

2. create tidb cluster with operator using above config

2. What did you expect to see? (Required)

tidb cluster create successfully

3. What did you see instead (Required)

Normal   Pulling           12m                  kubelet, [172.16.5.10](http://172.16.5.10/)  Pulling image "[hub-new.pingcap.net/qa/tidb:master](http://hub-new.pingcap.net/qa/tidb:master)"
  Normal   Pulled            12m                  kubelet, [172.16.5.10](http://172.16.5.10/)  Successfully pulled image "[hub-new.pingcap.net/qa/tidb:master](http://hub-new.pingcap.net/qa/tidb:master)" in 1.685824609s
  Normal   Created           12m                  kubelet, [172.16.5.10](http://172.16.5.10/)  Created container tidb
  Normal   Started           12m                  kubelet, [172.16.5.10](http://172.16.5.10/)  Started container tidb
  Warning  Unhealthy         118s (x60 over 11m)  kubelet, [172.16.5.10](http://172.16.5.10/)  Readiness probe failed: dial tcp [10.244.3.29:4000](http://10.244.3.29:4000/): connect: connection refused

4. What is your TiDB version? (Required)

["Welcome to TiDB."] ["Release Version"=v6.6.0-alpha] [Edition=Community] ["Git Commit Hash"=52e5a7bf3ed01398fab88d0d5575916eaff50f29] ["Git Branch"=heads/refs/tags/v6.6.0-alpha] ["UTC Build Time"="2023-02-07 11:51:26"] [GoVersion=go1.19.5] ["Race Enabled"=false] ["Check Table Before Drop"=false] ["TiKV Min Version"=6.2.0-alpha]

[seiya-annie]

tidb-unhealthy.log

[seiya-annie]

tidb cluster can deploy successfully if cpu core is more than 1