Fix : Server shouldn't start if HTTP_PORT is blocked

[coolwednesday]

Description:

• Closes Server shouldn't start if HTTP_PORT is blocked #1243

Checklist:

• I have formatted my code using goimport and golangci-lint.
• All new code is covered by unit tests.
• This PR does not decrease the overall code coverage.
• I have reviewed the code comments and documentation for clarity.

Thank you for your contribution!

[Umang01-hash]

Can we also add some test covering the new statements of code?

[ccoVeille]

I agree. I raised the point, I was not asking for one solution or another.

With your feedbacks, I think you could simply consider the following:

• if no port is provided in the conf (via env or anything), the code uses :0 then a free port is computed

It could help for tests.

But you could also use a TestMain and set to freeport, and then no need to provide some in each tests

Of course, it's out of the current PR

I can help on this

[aryanmehrotra]

Let's use free port