Bugfix in ECS forward

[kwitsch]

Changes:

• ecs resolver: bugfix for incorrect overrides of ecs option if forward is enabled and mask is set
• ecs resolver test: use ginkgo context instead of context.Background()
• devcontainer: set prettier as default formatter for yaml files
• example config: added ecs section

Closes #1288

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ac54110) 93.74% compared to head (5f1a484) 93.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1290      +/-   ##
==========================================
- Coverage   93.74%   93.61%   -0.13%     
==========================================
  Files          77       77              
  Lines        6087     6097      +10     
==========================================
+ Hits         5706     5708       +2     
- Misses        293      300       +7     
- Partials       88       89       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ThinkChaos]

That was fast since the report!

Just a couple minor things for clarity, mostly relating to the debug logs.