When the special positional params character isn't enclosed in double
quotes it prevents users from passing in arguments spanning multiple
words. For example, `--opt build-arg:"word1 word2"` fails. Enclosing in
double quotes treats each parameter as a separate word.
More here:
https://tiswww.case.edu/php/chet/bash/bashref.html#index-_0024_0040
Signed-off-by: Anurag Goel <anurag@render.com>