Add agent config option to set NGINX API URL and socket path

[dhurley]

Proposed changes

Example:

data_plane_config:
  nginx:
    api:
      url: "http://127.0.0.1:80/api"

Example with socket:

data_plane_config:
  nginx:
    api:
      socket: "unix:/var/run/nginx/nginx-status.sock"
      url: "http://localhost/api"

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[sjberman]

We've noticed occasional issues with agent finding the NGINX Plus API. Is this an attempt to work around that by being explicit?

[dhurley]

We've noticed occasional issues with agent finding the NGINX Plus API. Is this an attempt to work around that by being explicit?

Hi @sjberman this PR is to work around a specific use case where the server block and location block for the NGINX Plus API are in separate NGINX config files. Due to a limitation in the go-crossplane library that we use we can't construct the NGINX Plus API URL when the config is spread across multiple files.

[codecov]

Codecov Report

❌ Patch coverage is 59.22330% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.23%. Comparing base (a403571) to head (d3c1ebf).

Files with missing lines	Patch %	Lines
internal/datasource/config/nginx_config_parser.go	46.47%	31 Missing and 7 partials ⚠️
internal/config/config.go	90.00%	1 Missing and 1 partial ⚠️
internal/config/types.go	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1485      +/-   ##
==========================================
+ Coverage   85.22%   85.23%   +0.01%     
==========================================
  Files         102      102              
  Lines       12992    13060      +68     
==========================================
+ Hits        11072    11132      +60     
- Misses       1431     1436       +5     
- Partials      489      492       +3     

Files with missing lines	Coverage Δ
internal/config/flags.go	100.00% <ø> (ø)
internal/config/config.go	87.45% <90.00%> (+0.01%)	⬆️
internal/config/types.go	87.09% <83.33%> (-0.56%)	⬇️
internal/datasource/config/nginx_config_parser.go	79.46% <46.47%> (+0.76%)	⬆️

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