[BUILD] cleanup dockerfile warnings

[bowenliang123]

:mag: Description

Issue References 🔗

This pull request fixes #

Describe Your Solution 🔧

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

• [ ] 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 :coffin:

Behavior With This Pull Request :tada:

Related Unit Tests

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Checklist 📝

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

Be nice. Be informative.