fix the start script for alertmanager when enabling numa

[KanShiori]

What problem does this PR solve?

Close #2329

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Deploy a cluster with a alertmanager.

alertmanager_servers:
  - host: 127.0.0.1
    numa_node: "0"

Check the start script of this alertmanager.

#!/bin/bash
set -e

DEPLOY_DIR=/tidb-deploy/alertmanager-9093
cd "${DEPLOY_DIR}" || exit 1

# WARNING: This file was auto-generated. Do not edit!
#          All your edit might be overwritten!

exec > >(tee -i -a "/tidb-deploy/alertmanager-9093/log/alertmanager.log")
exec 2>&1
exec numactl --cpunodebind=0 --membind=0 bin/alertmanager/alertmanager \
    --config.file="conf/alertmanager.yml" \
    --storage.path="/tidb-data/alertmanager-9093" \
    --data.retention=120h \
    --log.level="info" \
    --web.listen-address="0.0.0.0:9093" \
    --web.external-url="http://127.0.0.1:9093" \
    --cluster.peer="127.0.0.1:9094" \
    --cluster.listen-address="127.0.0.1:9094"

• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0a96dad) 55.51% compared to head (a519d44) 55.37%.

❗ Current head a519d44 differs from pull request most recent head e76f364. Consider uploading reports for the commit e76f364 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2337      +/-   ##
==========================================
- Coverage   55.51%   55.37%   -0.14%     
==========================================
  Files         328      328              
  Lines       34823    34823              
==========================================
- Hits        19330    19282      -48     
- Misses      13180    13231      +51     
+ Partials     2313     2310       -3     

Flag	Coverage Δ
cluster	44.71% <ø> (-0.16%)	⬇️
dm	25.44% <ø> (-0.05%)	⬇️
playground	15.31% <ø> (ø)
tiup	33.56% <ø> (ø)
unittest	22.35% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-20 08:47:17.954031292 +0000 UTC m=+1037128.991258219: ☑️ agreed by breezewish.

[kaaaaaaang]

/lgtm

[kaaaaaaang]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaaaaaaang

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [kaaaaaaang]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment