chore: add full example using variables (#59)

* chore: add full example using variables

* chore: after go geneate

examples/full/init.sh

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+#!/bin/sh
+
+terraform init
+terraform plan

examples/full/main.tf

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+variable "HOOKDECK_API_KEY" {
+  type = string
+}
+
+variable "HEADER_FILTER_VALUES" {
+  type = list(string)
+}
+
+terraform {
+  required_providers {
+    hookdeck = {
+      source  = "hookdeck/hookdeck"
+      version = "~> 0.3.1"
+    }
+  }
+}
+
+provider "hookdeck" {
+  api_key = var.HOOKDECK_API_KEY
+}
+
+resource "hookdeck_source" "my_source" {
+  name = "my_source"
+}
+
+resource "hookdeck_destination" "my_destination" {
+  name = "my_destination"
+  url  = "https://mock.hookdeck.com"
+}
+
+resource "hookdeck_connection" "my_connection" {
+  source_id      = hookdeck_source.my_source.id
+  destination_id = hookdeck_destination.my_destination.id
+  rules = [
+    {
+      filter_rule = {
+        headers = {
+          json = jsonencode({
+            x-event-type = { "$or" : var.HEADER_FILTER_VALUES }
+          })
+        }
+      }
+    }
+  ]
+}

examples/full/terraform.tfvars

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+HOOKDECK_API_KEY = "<YOUR_HOOKDECK_API_KEY>"
+
+HEADER_FILTER_VALUES = [
+  "account.created.v1",
+  "transaction.cancelled.v1",
+  "transaction.pending.v1",
+  "transaction.processed.v1",
+  "account.updated.v2",
+  "account.deposit_started.v1",
+  "account.deposit_updated.v1",
+  "account.funds_invested.v1",
+  "account.funds_redeemed.v1",
+]