feat: create docker dev environment

.env

@@ -0,0 +1,2 @@
+USER_ID=1000
+GROUP_ID=1000

.gitignore

@@ -1,5 +1,6 @@
 .DS_Store
 .bundle
+.bash_history
 log
 tmp
 public/assets

Dockerfile-dev

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+FROM ruby:2.6.5
+
+ENV LANG=C.UTF-8
+ENV ENABLE_SERVICE_WORKER=true
+
+ARG USER_ID
+ARG GROUP_ID
+
+RUN apt-get update && \
+    apt-get -y install git nodejs libcurl4 && \
+    gem install bundler
+
+# Create the dev user and set up a home dir
+RUN if [ ${USER_ID:-0} -ne 0 ] && [ ${GROUP_ID:-0} -ne 0 ]; then \
+    groupadd -g ${GROUP_ID} devuser &&\
+    useradd -l -u ${USER_ID} -g devuser devuser &&\
+    install -d -m 0755 -o devuser -g devuser /home/devuser &&\
+    chown --changes --silent --no-dereference --recursive \
+          --from=33:33 ${USER_ID}:${GROUP_ID} \
+        /home/devuser \
+    ;fi
+
+# Host directories cannot be mounted by Dockerfiles so we have to use
+# a temporary directory to hold the lock files while the gems are installed.
+WORKDIR /devdocs/
+
+COPY Gemfile Gemfile.lock Rakefile /devdocs/
+
+RUN bundle install && rm -rf /devdocs/
+
+WORKDIR /home/devuser/
+
+EXPOSE 9292
+
+# This entrypoint lets you
+# docker-compose run --rm --service-ports devdocs
+# straight into a bash shell
+ENTRYPOINT [ "/bin/bash" ]
+
+USER devuser

docker-compose.yml

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+version: '3.7'
+services:
+  devdocs:
+    build:
+      context: .
+      dockerfile: Dockerfile-dev
+      args:
+        USER_ID: ${USER_ID:-0}
+        GROUP_ID: ${GROUP_ID:-0}
+    volumes:
+      - ${PWD}:/home/devuser
+    ports:
+      - "9292:9292"