fix(http): use document root instead of env in tempest serve

[aazsamir]

This #704 pull request added router for ./tempest serve to correctly handle paths with file extension.

It uses putenv but on default php environment $_ENV is not populated.
It depends on php.ini setting variables_order that often is set to GPCS instead of EGPCS.

But php cli allows to set $_SERVER['DOCUMENT_ROOT'] with -t flag, so we can use it to pass public path to router.

[coveralls]

Pull Request Test Coverage Report for Build 11787190071

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.009%) to 82.464%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/Tempest/Http/src/Commands/router.php	0	1	0.0%

Totals
Change from base Build 11770148738:	0.009%
Covered Lines:	7256
Relevant Lines:	8799

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💛 - Coveralls

[brendt]

Thanks!