Move to Ruby 2.7 for the default Docker version as well as the default target for alternative DB's. Fix the Ruby image version with three digits because the most recent versions seem to be somehow broken.

.github/workflows/continuous-integration.yml

@@ -22,17 +22,17 @@ jobs:
       - uses: actions/checkout@v1
       - run: bash -x script/cibuild 2.7 mysql
 
-  test26postgres:
+  test27postgres:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - run: bash -x script/cibuild 2.6 postgres
+      - run: bash -x script/cibuild 2.7 postgres
 
-  test26sqlite:
+  test27sqlite:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - run: bash -x script/cibuild 2.6 sqlite
+      - run: bash -x script/cibuild 2.7 sqlite
 
 #      - run: bash -x script/cibuild 2.5 postgres
 #      - run: bash -x script/cibuild 2.7 postgres

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.6
+FROM ruby:2.7.1
 
 # throw errors if Gemfile has been modified since Gemfile.lock
 RUN bundle config --global frozen 1

Dockerfile-2.5

@@ -1,4 +1,4 @@
-FROM ruby:2.5
+FROM ruby:2.5.7
 
 # throw errors if Gemfile has been modified since Gemfile.lock
 RUN bundle config --global frozen 1
@@ -7,14 +7,14 @@ WORKDIR /app
 
 RUN touch /etc/app-env
 
-COPY Gemfile* /app/
-RUN gem install bundler
-RUN bundle install --jobs 4
-
 RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
 RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
 RUN apt-get update && apt-get install -y yarn
 
+COPY Gemfile* /app/
+RUN gem install bundler
+RUN bundle install --jobs 4
+
 RUN mkdir /app/log
 
 COPY . /app/

Dockerfile-2.6

@@ -1,4 +1,4 @@
-FROM ruby:2.7
+FROM ruby:2.6.5
 
 # throw errors if Gemfile has been modified since Gemfile.lock
 RUN bundle config --global frozen 1
@@ -7,14 +7,14 @@ WORKDIR /app
 
 RUN touch /etc/app-env
 
-COPY Gemfile* /app/
-RUN gem install bundler
-RUN bundle install --jobs 4
-
 RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
 RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
 RUN apt-get update && apt-get install -y yarn
 
+COPY Gemfile* /app/
+RUN gem install bundler
+RUN bundle install --jobs 4
+
 RUN mkdir /app/log
 
 COPY . /app/

test-envs/docker-compose-2.6-mysql.yml

@@ -10,7 +10,7 @@ services:
   web:
     build:
       context: ..
-      dockerfile: Dockerfile
+      dockerfile: Dockerfile-2.6
     environment:
       # These are set in script/ci-build, so we need to pass-thru them.
       RAILS_ENV: $RAILS_ENV

test-envs/docker-compose-2.7-mysql.yml

@@ -10,7 +10,7 @@ services:
   web:
     build:
       context: ..
-      dockerfile: Dockerfile-2.7
+      dockerfile: Dockerfile
     environment:
       # These are set in script/ci-build, so we need to pass-thru them.
       RAILS_ENV: $RAILS_ENV