Set working path to release path by default for simple task

[antonmedv]

Q	A
Issue Type	Feature Request
Deployer Version	5.0.0

Description

Task can be defined with string:

task('name', 'command');

Allow to simple describe build steps.
Now for every build step users have to chdir to release dir manually:

task('deploy:build', 'cd {{release_path}} && webpack -p');

Let's improve DX and omit unnecessary cd!

Feature: use release_path if exists.

task('deploy:build', 'webpack -p');