[Task] Add "template" field for Global Event Rules and Service Event Rules

[giranm]

Summary

This PR enables users to define the "template" field within the action.extractions object, required for the "Customize Event Fields" section within the UI. This functionality is GA'd with the following public documentation:

• Documentation - Customize Event Fields
• REST API - Create an Event Rule

Tests

testAccCheckPagerDutyRulesetRuleConfig was updated to include the template field

% TF_ACC=1 go test -v ./pagerduty -run TestAccPagerDutyRulesetRule           
=== RUN   TestAccPagerDutyRulesetRule_import
--- PASS: TestAccPagerDutyRulesetRule_import (9.51s)
=== RUN   TestAccPagerDutyRulesetRule_Basic
--- PASS: TestAccPagerDutyRulesetRule_Basic (11.60s)
=== RUN   TestAccPagerDutyRulesetRule_MultipleRules
--- PASS: TestAccPagerDutyRulesetRule_MultipleRules (13.14s)
PASS
ok      github.com/terraform-providers/terraform-provider-pagerduty/pagerduty   34.830s

testAccCheckPagerDutyServiceEventRuleConfig was updated to include the template field

% TF_ACC=1 go test -v ./pagerduty -run TestAccPagerDutyServiceEventRule      
=== RUN   TestAccPagerDutyServiceEventRule_import
--- PASS: TestAccPagerDutyServiceEventRule_import (15.35s)
=== RUN   TestAccPagerDutyServiceEventRule_Basic
--- PASS: TestAccPagerDutyServiceEventRule_Basic (18.25s)
=== RUN   TestAccPagerDutyServiceEventRule_MultipleRules
--- PASS: TestAccPagerDutyServiceEventRule_MultipleRules (18.68s)
PASS
ok      github.com/terraform-providers/terraform-provider-pagerduty/pagerduty   52.888s

Example

I've included the Global Event Rule outputs below, similar outputs are seen for the Service Event Rule.

Code

resource "pagerduty_ruleset" "example_ruleset" {
  name = "Example Ruleset"
}

resource "pagerduty_ruleset_rule" "example_ruleset_rule" {
  ruleset = pagerduty_ruleset.example_ruleset.id
  conditions {
    operator = "and"
    subconditions {
      operator = "contains"
      parameter {
        value = "disk space"
        path  = "summary"
      }
    }
  }
  variable {
    type = "regex"
    name = "Src"
    parameters {
      value = "(.*)"
      path  = "payload.source"
    }
  }
  actions {
    extractions {
      target   = "summary"
      template = "{{Src}} | Some Issue Title"
    }
    extractions {
      target = "dedup_key"
      source = "payload.class"
      regex  = "(.*)"
    }
  }
}

Screenshots

[giranm]

Have raised PR heimweh/go-pagerduty#50 to ensure this is also captured at the underlying Go library.

[giranm]

Additional commit pushed to reflect changes to go-pagerduty lib.
go.mod, go.sum and modules.txt now available.

[stmcallister]

This looks great! Thanks for making the changes in the heimweh/go-pagerduty project as well and updating the modules here. 🎉