Allow to explicitly specify the transport to use for a site-alias

[ceesgeene]

Overview

This pull request:

Q	A
Bug fix?	no
New feature?	yes
Has tests?	yes
BC breaks?	no
Deprecations?	no

Summary

This allows to explicitly specify the transport to use.

Description

This for example allows for the use of the host property, without automatically forcing the ssh transport.

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.68%. Comparing base (49ec2b9) to head (1e51630).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ProcessManager.php	91.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #71      +/-   ##
============================================
+ Coverage     77.85%   78.68%   +0.83%     
- Complexity      174      177       +3     
============================================
  Files            20       20              
  Lines           438      441       +3     
============================================
+ Hits            341      347       +6     
+ Misses           97       94       -3     

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