libpq v12 testcase: ruby-pg

docker-compose.yml

testcase:
  build: .
  links:
    - db
db:
  image: postgres:11.5-alpine

Dockerfile

FROM ruby:2.6.5-buster

RUN curl -fsSL https://www.postgresql.org/media/keys/ACCC4CF8.asc -o /etc/apt/trusted.gpg.d/pgdg.asc
RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main' > /etc/apt/sources.list.d/pgdg.list
RUN apt-get update \
    && apt-get install -y --no-install-recommends libpq-dev \
    && rm -rf /var/lib/apt/lists/*

RUN gem install pg

COPY testcase.rb .
CMD ["ruby", "testcase.rb"]

testcase.rb

require "pg"

connection_parameters = {
  host: "db",
  user: "postgres",
  connect_timeout: "15s",
}

conn = PG.connect(connection_parameters)
conn.exec("SELECT 'test'") do |result|
  puts "Succeeded"
end