Fix tiup mirror merge usage

[lucklove]

No description provided.

[codecov-io]

Codecov Report

Merging #1008 (ea320c8) into master (081877a) will decrease coverage by 0.40%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1008      +/-   ##
==========================================
- Coverage   55.66%   55.26%   -0.41%     
==========================================
  Files         279      279              
  Lines       19743    19743              
==========================================
- Hits        10990    10911      -79     
- Misses       7042     7128      +86     
+ Partials     1711     1704       -7     

Flag	Coverage Δ
cluster	43.02% <ø> (-0.57%)	⬇️
dm	23.95% <ø> (-0.02%)	⬇️
integrate	49.49% <100.00%> (-0.45%)	⬇️
playground	20.32% <ø> (ø)
tiup	16.48% <100.00%> (ø)
unittest	23.01% <100.00%> (ø)

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

Impacted Files	Coverage Δ
cmd/mirror.go	48.63% <100.00%> (ø)
pkg/cluster/api/pdapi.go	53.25% <0.00%> (-7.44%)	⬇️
pkg/cluster/operation/scale_in.go	50.99% <0.00%> (-7.29%)	⬇️
pkg/cliutil/cliutil.go	60.71% <0.00%> (-7.15%)	⬇️
pkg/cluster/manager/destroy.go	64.78% <0.00%> (-5.64%)	⬇️
pkg/utils/http_client.go	67.56% <0.00%> (-5.41%)	⬇️
pkg/cluster/manager/display.go	79.52% <0.00%> (-3.15%)	⬇️
pkg/cluster/task/update_meta.go	76.92% <0.00%> (-3.08%)	⬇️
pkg/cluster/spec/tiflash.go	69.94% <0.00%> (-2.90%)	⬇️
pkg/cluster/spec/tispark.go	64.86% <0.00%> (-2.71%)	⬇️
... and 3 more

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[AstroProfundis]

/lgtm

[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ea320c8