bugfix: runiac_container build arg should only be added to docker bui…

[tiny-dancer]

bugfix: runiac_container build arg should only be added to docker build when value exists

Proposed changes

Issues for these changes

Types of changes

• [x] 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 not work as expected)
• [ ] Refactor (changes to code, which do not change application behavior)

Checklist

• [ ] I have filled out this PR template
• [ ] I have read the CONTRIBUTING doc
• [ ] I have added automated tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (README.md, CHANGELOG.md, etc. - if appropriate)

Dependencies and Blockers

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Further comments

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Unit Test Results

  1 files  ±0  13 suites  ±0   0s :stopwatch: ±0s 48 tests +1  48 :heavy_check_mark: +1  0 :zzz: ±0  0 :x: ±0 

Results for commit e2c36eab. ± Comparison against base commit d2bdc652.

[github-actions[bot]]

Unit Test Results

  1 files  ±0  13 suites  ±0   0s :stopwatch: ±0s 48 tests +1  48 :heavy_check_mark: +1  0 :zzz: ±0  0 :x: ±0 

Results for commit 50657920. ± Comparison against base commit d2bdc652.