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

• 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

[github-actions]

Unit Test Results

  1 files  ±0  13 suites  ±0   0s ⏱️ ±0s
48 tests +1  48 ✔️ +1  0 💤 ±0  0 ❌ ±0 

Results for commit 5065792. ± Comparison against base commit d2bdc65.