chore: add ruby 2.4 support

.drone.yml

@@ -15,8 +15,8 @@ volumes:
       path: /home/data/drone/key_cache
 
 spec_step_common: &spec_step_common
-  image: abakpress/dind-testing
-  pull: always
+  image: abakpress/dind-testing:1.0.3
+  pull: if-not-exists
   privileged: true
   volumes:
     - name: images
@@ -56,9 +56,18 @@ steps:
       RAILS_ENV: test
     <<: *spec_step_common
 
+  - name: Tests Ruby 2.4
+    environment:
+      COMPOSE_FILE_EXT: drone
+      DOCKER_RUBY_VERSION: 2.4
+      RUBY_IMAGE_TAG: 2.4-latest
+      POSTGRES_IMAGE_TAG: 9.6-latest
+      RAILS_ENV: test
+    <<: *spec_step_common
+
   - name: release
     image: abakpress/gem-publication:latest
-    pull: true
+    pull: if-not-exists
     when:
       event: push
       branch: master

Appraisals

@@ -1,9 +1,7 @@
-appraise 'rails4.0' do
-  gem 'rails', '~> 4.0.0'
-end
-
-appraise 'rails4.1' do
-  gem 'rails', '~> 4.1.0'
+if RUBY_VERSION < '2.4'
+  appraise 'rails4.0' do
+    gem 'rails', '~> 4.0.0'
+  end
 end
 
 appraise 'rails4.2' do

dip.yml

@@ -1,10 +1,10 @@
 version: '1'
 
 environment:
-  DOCKER_RUBY_VERSION: 2.2
-  RUBY_IMAGE_TAG: 2.2-latest
+  DOCKER_RUBY_VERSION: 2.3
+  RUBY_IMAGE_TAG: 2.3-latest
   POSTGRES_IMAGE_TAG: 9.3-latest
-  REDIS_IMAGE_TAG: 3-alpine
+  REDIS_IMAGE_TAG: 4-alpine
   COMPOSE_FILE_EXT: development
   RAILS_ENV: test
   APRESS_GEMS_CREDENTIALS: ""