fix: correct shell command substitution syntax in Makefile

[yankay]

Summary

Fix Makefile syntax issues by correcting shell command substitution and indentation errors.

Problem Solved

Resolves "Unsupported Linux package manager" error when running make download-zmq on Ubuntu systems. logs:

# make download-zmq
Checking if ZMQ is already installed...
Installing ZMQ dependencies...
Unsupported Linux package manager. Install libzmq manually.
make: *** [Makefile:339: download-zmq] Error 1

The issue was caused by incorrect Make variable substitution syntax, where $(command -v apt)was being evaluated by Make at parse time instead of being passed to the shell for runtime evaluation.

It also fixed an indentation error in uninstall-docker.

[elevran]

@yankay would you kindly rebase on the latest so we can move ahead merging the PR?

[yankay]

@yankay would you kindly rebase on the latest so we can move ahead merging the PR?

Thanks @elevran
It has been merged :-)

[elevran]

main seems to be somewhat of a moving target.
Let me know if you're ok with me rebasing and merging or prefer to validate the rebase yourself.

[yankay]

Thanks @elevran

I've validate the rebase , it's ok :-)

[nirrozenbaum]

Thanks @yankay 🙏🏼