Support tc.host

Read `tc.host` property from `~/.testcontainers.properties` file.

core/Gemfile.lock

@@ -3,6 +3,7 @@ PATH
   specs:
     testcontainers-core (0.2.0)
       docker-api (~> 2.2)
+      properties-ruby (~> 0.0.4)
 
 GEM
   remote: https://rubygems.org/
@@ -15,13 +16,16 @@ GEM
     json (2.6.3)
     language_server-protocol (3.17.0.3)
     lint_roller (1.0.0)
+    logeasy (0.0.8)
     minitest (5.18.0)
     minitest-hooks (1.5.0)
       minitest (> 5.3)
     multi_json (1.15.0)
     parallel (1.23.0)
     parser (3.2.2.1)
       ast (~> 2.4.1)
+    properties-ruby (0.0.4)
+      logeasy (>= 0.0.4)
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.8.0)
@@ -63,6 +67,7 @@ PLATFORMS
 DEPENDENCIES
   minitest (~> 5.0)
   minitest-hooks (~> 1.5)
+  properties-ruby (~> 0.0.4)
   rake (~> 13.0)
   standard (~> 1.3)
   testcontainers-core!

core/lib/testcontainers/docker_container.rb

@@ -1,3 +1,4 @@
+require 'properties-ruby'
 module Testcontainers
   # The DockerContainer class is used to manage Docker containers.
   # It provides an interface to create, start, stop, and manipulate containers
@@ -472,7 +473,16 @@ def use
     # @raise [ConnectionError] If the connection to the Docker daemon fails.
     # @raise [NotFoundError] If Docker is unable to find the image.
     def start
-      Docker::Image.create({"fromImage" => @image}.merge(@image_create_options))
+      properties = Utils::Properties.load_from_file(File.expand_path('~/.testcontainers.properties'))
+      tc_host = properties.get(:"tc.host")
+
+      if tc_host && !tc_host.empty?
+        Docker.url = tc_host
+      end
+
+      connection = Docker::Connection.new(Docker.url, Docker.options)
+
+      Docker::Image.create({"fromImage" => @image}.merge(@image_create_options), connection)
 
       @_container ||= Docker::Container.create(_container_create_options)
       @_container.start

core/testcontainers-core.gemspec

@@ -31,6 +31,7 @@ Gem::Specification.new do |spec|
 
   # Uncomment to register a new dependency of your gem
   spec.add_dependency "docker-api", "~> 2.2"
+  spec.add_dependency "properties-ruby", "~> 0.0.4"
 
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "minitest", "~> 5.0"