[improve][build] add --no-cache-dir in dockerfile to disable the pip cache

[ericsyh]

Motivation

It's usually suggested to add --no-cache-dir in dockerfile because PIP cache is useless in image and we can also reduce the image size by disabling the cache.

Modifications

Add the --no-cache-dir in dockerfile pip3 command.

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository:

[codecov-commenter]

Codecov Report

Merging #20477 (0bfb5e5) into master (5e6e6ce) will increase coverage by 0.00%.
The diff coverage is 53.48%.

@@            Coverage Diff            @@
##             master   #20477   +/-   ##
=========================================
  Coverage     72.95%   72.96%           
- Complexity    31914    31920    +6     
=========================================
  Files          1867     1867           
  Lines        138485   138523   +38     
  Branches      15202    15204    +2     
=========================================
+ Hits         101037   101077   +40     
+ Misses        29438    29431    -7     
- Partials       8010     8015    +5     

Flag	Coverage Δ
inttests	24.14% <0.00%> (+0.02%)	⬆️
systests	24.95% <2.32%> (-0.08%)	⬇️
unittests	72.25% <53.48%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
...bookkeeper/mledger/ManagedLedgerFactoryConfig.java	89.47% <ø> (-0.53%)	⬇️
...ar/broker/authorization/AuthorizationProvider.java	8.51% <0.00%> (-0.80%)	⬇️
...lsar/broker/loadbalance/impl/ThresholdShedder.java	82.53% <20.00%> (-1.34%)	⬇️
...ker/authorization/PulsarAuthorizationProvider.java	71.19% <61.29%> (-1.45%)	⬇️
...sar/broker/authorization/AuthorizationService.java	57.53% <100.00%> (+0.33%)	⬆️

... and 74 files with indirect coverage changes

[tisonkun]

Thank you!