chore: let Terraform to manage UptimeRobot account

Fix #1301

[skip ci]

Author: php-coder

infra/terraform/README.md

@@ -17,7 +17,7 @@
   $ export HTTPS_PROXY=socks5://127.0.0.1:1122 # optionally
   $ terraform init
   ```
-* Import existing configuration (optionally; only first time)
+* Import existing DigitalOcean configuration (optionally; only the first time)
   ```console
   $ terraform import digitalocean_droplet.web <id>
   $ terraform import digitalocean_domain.site my-stamps.ru
@@ -43,6 +43,23 @@
   12345678
   $ curl -sS -H "Content-Type: application/json" -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" "https://api.digitalocean.com/v2/domains/my-stamps.ru/records" | jq
   ```
+* Import existing UptimeRobot configuration (optionally; only the first time)
+  ```console
+  $ terraform import uptimerobot_alert_contact.email <id>
+  $ terraform import uptimerobot_monitor.mystamps <id>
+  $ terraform import uptimerobot_status_page.status_page <id>
+  ```
+  The ids can be obtained by making `/v2/getAlertContacts`, `/v2/getMonitors`, and `/v2/getPSPs` API calls (see https://uptimerobot.com/api/ for details).
+  For example:
+  ```console
+  $ export UPTIMEROBOT_TOKEN="$(grep -Po 'uptimerobot_token = "\K[^\"]+' terraform.tfvars)"
+  $ curl -sS -H 'Content-Type: application/x-www-form-urlencoded' -H 'Cache-Control: no-cache' -d "api_key=$UPTIMEROBOT_TOKEN" 'https://api.uptimerobot.com/v2/getAlertContacts' | jq -r '.alert_contacts[].id'
+  1234567
+  $ curl -sS -H 'Content-Type: application/x-www-form-urlencoded' -H 'Cache-Control: no-cache' -d "api_key=$UPTIMEROBOT_TOKEN" 'https://api.uptimerobot.com/v2/getMonitors' | jq '.monitors[].id'
+  123456789
+  $ curl -sS -H 'Content-Type: application/x-www-form-urlencoded' -H 'Cache-Control: no-cache' -d "api_key=$UPTIMEROBOT_TOKEN" 'https://api.uptimerobot.com/v2/getPSPs' | jq '.psps[].id'
+  1234
+  ```
 * Plan and apply:
   ```console
   $ terraform plan -out terraform.tfplan

infra/terraform/my-stamps.tf

@@ -1,5 +1,4 @@
 # @todo #1000 CI: validate and check Terraform configuration
-# @todo #1000 Terraform: add UptimeRobot
 # @todo #1000 Terraform: add Mailgun
 
 variable "do_token" {
@@ -8,6 +7,15 @@ variable "do_token" {
   type        = string
 }
 
+variable "uptimerobot_token" {
+  # How to create API Key:
+  # - open https://uptimerobot.com/dashboard
+  # - go to MySettings
+  # - scroll down to API Settings and select "Main API Key"
+  description = "UptimeRobot API key"
+  type        = string
+}
+
 # Digital Ocean provider docs: https://registry.terraform.io/providers/digitalocean/digitalocean/2.28.1/docs
 provider "digitalocean" {
   token = var.do_token
@@ -107,3 +115,33 @@ resource "digitalocean_record" "domain_key" {
   value  = "k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLo/TZgHYIM7xrU9dBJCJTTsP90rGhHuyTqSrC3LT+T3vsH5azrz1+9Dm86xz6TpcmrHV1WgmSnw72C++AXstlS8CEg6Z6XVuxMDKsMnMVEWDm1bpESy+h29Ns3kY/EzMTaF1V88ICmr6fSpQIOd9u/lZpsABjfh2wfag1rqWcGwIDAQAB"
 }
 
+
+# UptimeRobot provider docs: https://registry.terraform.io/providers/vexxhost/uptimerobot/0.8.2/docs
+provider "uptimerobot" {
+  api_key = var.uptimerobot_token
+}
+
+# https://registry.terraform.io/providers/vexxhost/uptimerobot/0.8.2/docs/resources/alert_contact
+resource "uptimerobot_alert_contact" "email" {
+  value         = "[email protected]"
+  type          = "e-mail"
+  friendly_name = "[email protected]"
+}
+
+# https://registry.terraform.io/providers/vexxhost/uptimerobot/0.8.2/docs/resources/monitor
+resource "uptimerobot_monitor" "mystamps" {
+  url           = "https://my-stamps.ru"
+  type          = "http"
+  friendly_name = "MyStamps"
+  interval      = 300 # 300 seconds by default
+
+  alert_contact {
+    id = uptimerobot_alert_contact.email.id
+  }
+}
+
+# https://registry.terraform.io/providers/vexxhost/uptimerobot/0.8.2/docs/resources/status_page
+resource "uptimerobot_status_page" "status_page" {
+  friendly_name = "MyStamps Site Status"
+  monitors = [ uptimerobot_monitor.mystamps.id ]
+}

infra/terraform/versions.tf

@@ -7,5 +7,9 @@ terraform {
       source  = "digitalocean/digitalocean"
       version = "2.28.1"
     }
+    uptimerobot = {
+      source  = "vexxhost/uptimerobot"
+      version = "0.8.2"
+    }
   }
 }