feat: add support for webhook resource

[nukosuke]

• related to Add support for "webhooks" #221
• Add webhook resource, docs and example.
• No test code yet

manual test

build

~/workspace/github.com/nukosuke/terraform-provider-zendesk/examples feature/webhook ───────────────────────────────────────────────────────────────────────────────────────────────────   api 03:19:34
❯ make install
mkdir -p build
go build -o build/terraform-provider-zendesk_v0.0.4 ../.

terraform plan

~/workspace/github.com/nukosuke/terraform-provider-zendesk/examples feature/webhook ──────────────────────────────────────────────────────────────────────────────────────────────── 3s   api 03:19:40
❯ terraform plan
╷
│ Warning: Provider development overrides are in effect
│ 
│ The following provider development overrides are set in the CLI configuration:
│  - nukosuke/zendesk in build
│ 
│ The behavior may therefore not match any released version of the provider and applying changes may cause the state to become incompatible with published releases.
╵

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # zendesk_webhook.example-basic-auth-webhook will be created
  + resource "zendesk_webhook" "example-basic-auth-webhook" {
      + endpoint       = "https://example.com/status/200"
      + http_method    = "POST"
      + id             = (known after apply)
      + name           = "Example Webhook with Basic Auth"
      + request_format = "json"
      + status         = "active"
      + subscriptions  = [
          + "conditional_ticket_events",
        ]

      + authentication {
          + add_position = "header"
          + data         = (sensitive value)
          + type         = "basic_auth"
        }
    }

  # zendesk_webhook.example-bearer-token-webhook will be created
  + resource "zendesk_webhook" "example-bearer-token-webhook" {
      + endpoint       = "https://example.com/status/200"
      + http_method    = "POST"
      + id             = (known after apply)
      + name           = "Example Webhook with Bearer token"
      + request_format = "json"
      + status         = "active"
      + subscriptions  = [
          + "conditional_ticket_events",
        ]

      + authentication {
          + add_position = "header"
          + data         = (sensitive value)
          + type         = "bearer_token"
        }
    }

  # zendesk_webhook.example-webhook will be created
  + resource "zendesk_webhook" "example-webhook" {
      + endpoint       = "https://example.com/status/200"
      + http_method    = "GET"
      + id             = (known after apply)
      + name           = "Example Webhook without authentication"
      + request_format = "json"
      + status         = "active"
      + subscriptions  = [
          + "conditional_ticket_events",
        ]
    }

Plan: 3 to add, 0 to change, 0 to destroy.

───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if you run "terraform apply" now.

terraform apply

~/workspace/github.com/nukosuke/terraform-provider-zendesk/examples feature/webhook ───────────────────────────────────────────────────────────────────────────────────────────────────   api 03:20:23
❯ terraform apply
╷
│ Warning: Provider development overrides are in effect
│ 
│ The following provider development overrides are set in the CLI configuration:
│  - nukosuke/zendesk in build
│ 
│ The behavior may therefore not match any released version of the provider and applying changes may cause the state to become incompatible with published releases.
╵

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # zendesk_webhook.example-basic-auth-webhook will be created
  + resource "zendesk_webhook" "example-basic-auth-webhook" {
      + endpoint       = "https://example.com/status/200"
      + http_method    = "POST"
      + id             = (known after apply)
      + name           = "Example Webhook with Basic Auth"
      + request_format = "json"
      + status         = "active"
      + subscriptions  = [
          + "conditional_ticket_events",
        ]

      + authentication {
          + add_position = "header"
          + data         = (sensitive value)
          + type         = "basic_auth"
        }
    }

  # zendesk_webhook.example-bearer-token-webhook will be created
  + resource "zendesk_webhook" "example-bearer-token-webhook" {
      + endpoint       = "https://example.com/status/200"
      + http_method    = "POST"
      + id             = (known after apply)
      + name           = "Example Webhook with Bearer token"
      + request_format = "json"
      + status         = "active"
      + subscriptions  = [
          + "conditional_ticket_events",
        ]

      + authentication {
          + add_position = "header"
          + data         = (sensitive value)
          + type         = "bearer_token"
        }
    }

  # zendesk_webhook.example-webhook will be created
  + resource "zendesk_webhook" "example-webhook" {
      + endpoint       = "https://example.com/status/200"
      + http_method    = "GET"
      + id             = (known after apply)
      + name           = "Example Webhook without authentication"
      + request_format = "json"
      + status         = "active"
      + subscriptions  = [
          + "conditional_ticket_events",
        ]
    }

Plan: 3 to add, 0 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

zendesk_webhook.example-webhook: Creating...
zendesk_webhook.example-bearer-token-webhook: Creating...
zendesk_webhook.example-basic-auth-webhook: Creating...
zendesk_webhook.example-bearer-token-webhook: Creation complete after 1s [id=01G1982EXJ6JPFMN4XXZ7WZBRE]
zendesk_webhook.example-basic-auth-webhook: Creation complete after 1s [id=01G1982EXGASJ6EE6X9G8M1R88]
zendesk_webhook.example-webhook: Creation complete after 1s [id=01G1982EY8WAQ0YVPW43GY60NN]

Apply complete! Resources: 3 added, 0 changed, 0 destroyed.

Zendesk