Fix cargo make package

[russcam]

• Missing exec
• Needs to run a different command depending on whether flags are passed. This is different to cargo publish, which ignores trailing whitespace when flags are empty.

[russcam]

cargo package fails?

yeah, when run through cargo make

cargo make package
[cargo-make] INFO - cargo make 0.32.9
[cargo-make] INFO - Build File: Makefile.toml
[cargo-make] INFO - Task: package
[cargo-make] INFO - Profile: development
[cargo-make] INFO - Running Task: package
packaging elasticsearch crate: cargo package
error: Found argument '' which wasn't expected, or isn't valid in this context

USAGE:
    cargo.exe package [OPTIONS]

For more information try --help
[cargo-make] INFO - Build Done in 0 seconds.

🤷