Bitbucket Pipeline breaks with long command

[victorferreirait]

I have this bug in my pipeline that started yesterday when I added a second environment variable that changes the `docker build` command.

this command does not work (real values were replaced)

docker build -f mydir/Dockerfile -t my/corp/tag --build-arg VAR1=$VAR1 --build-arg VAR2=$VAR2 . 

With error `"docker build" requires exactly 1 argument.`

The build args list is dynamically generated. If I write the command as is and execute, the same error happens. It took me a while to find out that this works:

docker build -f mydir/Dockerfile -t my/corp/tag --build-arg VAR1=$VAR1 . 

At first I thought that the problem was the amount of arguments and that a special character was breaking the interpreter. 

Then it came to my mind that the LENGTH of the command was too long. With the two arguments, 278 characters.and with only one, it's 189. It breaks somewhere between 190 and 278 characters long.

Is that an known issue? Is there a workaround? Could someone help me please