docker: support --nodes

[9547]

What problem does this PR solve?

I'm try to reproduce this issue #1187, and want to start N nodes, but currently TiUP only starts 5 nodes, I want to start more nodes, so I added this argument.

What is changed and how it works?

This PR will install the jinja2 tool from https://github.com/kolypto/j2cli, and use this tool to generate --nodes tiup-cluster-node.

Check List

Tests

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

[lucklove]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• lucklove

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[lucklove]

/merge

[ti-chi-bot]

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

Commit hash: b13a3ec

[codecov-io]

Codecov Report

Merging #1251 (93ed572) into master (09c186a) will decrease coverage by 19.78%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1251       +/-   ##
===========================================
- Coverage   53.55%   33.77%   -19.79%     
===========================================
  Files         289      254       -35     
  Lines       20773    17872     -2901     
===========================================
- Hits        11126     6037     -5089     
- Misses       7911    10785     +2874     
+ Partials     1736     1050      -686     

Flag	Coverage Δ
cluster	30.50% <ø> (-14.66%)	⬇️
dm	19.76% <ø> (-6.86%)	⬇️
integrate	33.77% <ø> (-14.28%)	⬇️
playground	?
tiup	?
unittest	?

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

Impacted Files	Coverage Δ
pkg/repository/store/store.go	0.00% <0.00%> (-100.00%)	⬇️
components/dm/ansible/worker.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/cluster/template/config/config.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/cluster/template/scripts/scripts.go	0.00% <0.00%> (-100.00%)	⬇️
components/dm/task/update_dm_meta.go	0.00% <0.00%> (-85.30%)	⬇️
pkg/repository/utils/hash.go	0.00% <0.00%> (-81.82%)	⬇️
pkg/meta/err.go	0.00% <0.00%> (-81.25%)	⬇️
pkg/telemetry/meta.go	0.00% <0.00%> (-80.00%)	⬇️
pkg/telemetry/scrub.go	6.66% <0.00%> (-80.00%)	⬇️
pkg/cluster/template/scripts/tiflash.go	0.00% <0.00%> (-79.60%)	⬇️
... and 180 more

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[ti-chi-bot]

@9547: Your PR was out of date, I have automatically updated it for you.

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