change port bind and add a unittest

[MichelleArk]

resolves #10209

Problem

Solution

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.68%. Comparing base (eb71ad9) to head (00b1211).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10208      +/-   ##
==========================================
+ Coverage   88.59%   88.68%   +0.08%     
==========================================
  Files         180      180              
  Lines       22435    22435              
==========================================
+ Hits        19876    19896      +20     
+ Misses       2559     2539      -20     

Flag	Coverage Δ
integration	85.95% <0.00%> (ø)
unit	63.27% <100.00%> (+0.08%)	⬆️

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[macnibblet]

@MichelleArk While I understand the sanity of having 127.0.0.1 as the default bind address, this broke our k8s deployment because the readiness check cannot pass and I cannot override the bind address because it's hard coded.

Can we add a cli/env flag to override this?

[MichelleArk]

Ach, sorry about that! I think an override sounds completely reasonable here, perhaps something like dbt docs serve --host.

cc @jtcohen6

[jtcohen6]

Makes sense to me! We already support --port, so it makes sense to support --host as well, with 127.0.0.1 as the default:

$ dbt docs serve --host 127.0.01 --port 8080