feat: add docker

Author: KonnorRogers

.dockerignore

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+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+
+# rspec failure tracking
+.rspec_status
+
+public/
+.cache/
+
+log/
+
+node_modules/
+
+.vscode/
+/tags
+.gitignore

Dockerfile

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+FROM ruby:2.6-alpine3.11 as builder
+
+# Install system dependencies & clean them up
+RUN apk add --no-cache --virtual \
+   nodejs-dev yarn bash \
+   tzdata build-base libffi-dev \
+   curl git vim \
+   libnotify-dev
+
+FROM builder as bridgetownrb-app
+
+# This is to fix an issue on Linux with permissions issues
+ARG USER_ID=${USER_ID:-1000}
+ARG GROUP_ID=${GROUP_ID:-1000}
+ARG DOCKER_USER=${DOCKER_USER:-user}
+ARG APP_DIR=${APP_DIR:-/home/user/snowpacker}
+
+# Create a non-root user
+RUN addgroup -g $GROUP_ID -S $GROUP_ID
+RUN adduser --disabled-password -G $GROUP_ID --uid $USER_ID -S $DOCKER_USER
+
+# Create and then own the directory to fix permissions issues
+RUN mkdir -p $APP_DIR
+RUN chown -R $USER_ID:$GROUP_ID $APP_DIR
+
+# Define the user running the container
+USER $USER_ID:$GROUP_ID
+
+# . now == $APP_DIR
+WORKDIR $APP_DIR
+
+# COPY is run as a root user, not as the USER defined above, so we must chown it
+COPY --chown=$USER_ID:$GROUP_ID Gemfile* $APP_DIR/
+RUN gem install bundler
+RUN bundle install
+
+CMD ["bundle", "exec", "rake", "test"]

docker-compose.yml

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+version: "3"
+
+services:
+  web:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        USER_ID: ${USER_ID:-1000}
+        GROUP_ID: ${GROUP_ID:-1000}
+        DOCKER_USER: ${DOCKER_USER:-user}
+        APP_DIR: ${APP_DIR:-/home/user/bridgetown-app}
+
+    command: bash -c "bundle exec rake test"
+
+    volumes:
+      - .:${APP_DIR:-/home/user/snowpacker}

docker.env

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+# Assign and export seperately to avoid masking return values.
+USER_ID=$(id -u "$USER")
+GROUP_ID=$(id -g "$USER")
+export USER_ID
+export GROUP_ID
+
+export DOCKER_USER="user"
+export APP_DIR="/home/$DOCKER_USER/bridgetown"