Refactor build script to use bash arrays instead of string concatenation

[miragecentury]

Summary

Refactored the Docker build script in the release workflow to use bash arrays for constructing build arguments and labels instead of string concatenation. This improves code robustness and eliminates the need for shellcheck directives.

Key Changes

• Converted BUILD_ARGS from a string variable to an array, using yq with process substitution for cleaner iteration
• Converted LABELS from a string variable to an array, appending label entries with proper quoting
• Updated the buildah build command to use array expansion syntax ("${BUILD_ARGS[@]}" and "${LABELS[@]}") instead of unquoted variable expansion
• Removed the shellcheck disable=SC2086 comment as it's no longer needed with proper array handling

Implementation Details

• Used bash arrays with the += operator for appending elements, which is more idiomatic than string concatenation
• Maintained proper quoting around array elements to handle values with spaces or special characters
• Preserved the existing label parsing logic (key-value extraction and quote trimming) while improving the variable handling

https://claude.ai/code/session_01WtJC749bMVKy7Xxr5P2WD7