Adds a fly.toml for deploying to fly.io

fly.toml

@@ -0,0 +1,17 @@
+app = 'web-check'
+primary_region = 'lhr'
+
+[build]
+
+[http_service]
+  internal_port = 3000
+  force_https = true
+  auto_stop_machines = true
+  auto_start_machines = true
+  min_machines_running = 0
+  processes = ['app']
+
+[[vm]]
+  memory = '1gb'
+  cpu_kind = 'shared'
+  cpus = 1