[BUILD] cleanup dockerfile warnings

[bowenliang123]

🔍 Description

Issue References 🔗

This pull request fixes #

Describe Your Solution 🔧

• fix the dockerfile warning reported by GitHub Actions / Kyuubi Server On Kubernetes Integration Test :

  • Legacy key/value format with whitespace separator should not be used
    LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format
    More info: https://docs.docker.com/go/dockerfile/rule/legacy-key-value-format/

  • The 'as' keyword should match the case of the 'from' keyword
    FromAsCasing: 'as' and 'FROM' keywords' casing do not match
    More info: https://docs.docker.com/go/dockerfile/rule/from-as-casing/

Types of changes 🔖

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Test Plan 🧪

Behavior Without This Pull Request ⚰️

Behavior With This Pull Request 🎉

Related Unit Tests

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Checklist 📝

• This patch was not authored or co-authored using Generative Tooling

Be nice. Be informative.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (1e9d68b) to head (d9d7b74).
Report is 3 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #6762   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files         684     684           
  Lines       42353   42353           
  Branches     5775    5775           
======================================
  Misses      42353   42353           

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[bowenliang123]

Thanks, merged to master(1.10.0).