Add metric for num.rpz.action

[pgporada]

Enables rpz support in the example unbound config and gathering a metric for each triggered rpz action.

$ curl -s localhost:9167/metrics | grep rpz
# HELP unbound_rpz_action_count Total number of triggered Response Policy Zone actions, by action.
# TYPE unbound_rpz_action_count counter
unbound_rpz_action_count{type="nxdomain"} 1

Fixes #69

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5e9c7ff) 5.23% compared to head (79ea4be) 5.23%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #70   +/-   ##
=====================================
  Coverage   5.23%   5.23%           
=====================================
  Files          1       1           
  Lines        191     191           
=====================================
  Hits          10      10           
  Misses       181     181           

Flag	Coverage Δ
unbound_exporter_tests	5.23% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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

[raunz]

👍 Looks great.