Get containers working reliably

Fix bundler issue in build, and getcwd error due to volumes (similar to
docker/for-mac#1509)

.travis.yml

@@ -4,6 +4,6 @@ services:
   - docker
 before_install:
   - bin/setup
-  - gem update bundler
+  - gem install -v 2.2 bundler -N
 script:
   - rake

Dockerfile

@@ -1,7 +1,8 @@
-FROM ruby:2.4.0
+FROM ruby:2.6.6
 RUN apt-get update -qq
-RUN gem update bundler
-ENV BUNDLER_VERSION=2.0.2
+RUN gem update --system
+RUN gem install -v 2.2.3 bundler -N
+ENV BUNDLER_VERSION=2.2
 RUN mkdir /simple_jsonapi_client
 WORKDIR /simple_jsonapi_client
 ADD . .

docker-compose.yml

@@ -16,9 +16,8 @@ services:
   jsonapi_app_spec:
     build: ./spec/jsonapi_app
     entrypoint: bin/wait_for_it db:5432 -t 30 --
-    volumes:
-      - ./spec/jsonapi_app:/jsonapi_app
-      - /jsonapi_app/tmp/
+    # volumes:
+      # - ./spec/jsonapi_app:/jsonapi_app
     command: bundle exec rails s -p 3001 -b '0.0.0.0'
     ports:
       - "3001:3001"
@@ -40,9 +39,8 @@ services:
   jsonapi_app_console:
     build: ./spec/jsonapi_app
     entrypoint: bin/wait_for_it db:5432 -t 30 --
-    volumes:
-      - ./spec/jsonapi_app:/jsonapi_app
-      - /jsonapi_app/tmp/
+    # volumes:
+      # - ./spec/jsonapi_app:/jsonapi_app
     command: bundle exec rails s -p 3002 -b '0.0.0.0'
     ports:
       - "3002:3002"

spec/jsonapi_app/.dockerignore

@@ -0,0 +1 @@
+tmp/pids/server.pid

spec/jsonapi_app/Dockerfile

@@ -1,6 +1,7 @@
-FROM ruby:2.4.0
+FROM ruby:2.6.6
 RUN apt-get update -qq
-RUN gem update bundler
+RUN gem update --system
+RUN gem install -v 2.2.3 bundler -N
 RUN mkdir /jsonapi_app
 WORKDIR /jsonapi_app
 ADD Gemfile /jsonapi_app/Gemfile

spec/jsonapi_app/Gemfile.lock

@@ -128,4 +128,4 @@ DEPENDENCIES
   rails (~> 5.0.1)
 
 BUNDLED WITH
-   1.15.3
+   2.2.3