🔥Docker and environment variables cleanup (#270)

* Added dotenv-rails gem to manage environment variables

* Added dotenv-rails gem to manage environment variables
* Removed figaro which was used earlier for this purpose

* Standardized variable names

* Changed all env variables to be upper case. This included changes in files referencing env variables.
* Added example env file with all variables set to empty value
* Removed the earlier setup of copying application.yml and database.yml and the scripts and documentation associated to this

* Docker setup

* Added docker file for building the docker images
* Added entrypoint.sh script which is referenced inside the Docker image
* Cloned the Procfile for development using docker which has slight change compared to regular procfile
* Added the docker-compose.yml which has 3 service's configuration, postgres, redis and chatwoot server and a mounted volume for postgres

* Added docker related info to documentation

* Added the docker setup info in the documentation
* Added info for using`rbenv` instead of rvm for managing ruby versions
* Updated the documentation for environment variables to have one about `dotenv-rails` gem and removed the documentation about the old copy paste method used by figaro

* Changing the postgres database, username and password as environment variables

* Removed database.yml from gitignore
* Made the postgres databse, username and password as environemnt variables
* Added this in documentation

* Added a quick setup page

* Added quick setup page
* Removed the docs from README and added link to the docs in website
* Removed the figaro related things from circle.ci config

* Adding external volume for redis in docker compose

* Added instructions for adding the redis volume in docs

docker/Dockerfile

@@ -0,0 +1,32 @@
+FROM ruby:2.6.5-slim
+
+RUN apt-get update \
+    && apt-get -qq -y install \
+    build-essential \
+    curl \
+    git \
+    imagemagick \
+    libpq-dev \
+    && curl -L https://deb.nodesource.com/setup_12.x | bash - \
+    && curl https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
+    && echo 'deb https://dl.yarnpkg.com/debian stable main' > /etc/apt/sources.list.d/yarn.list \
+    && apt-get update \
+    && apt-get -qq -y install nodejs yarn \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /app
+WORKDIR /app
+COPY . /app
+
+RUN bundle
+RUN yarn
+RUN bundle exec rake assets:precompile
+
+# Add a script to be executed every time the container starts.
+COPY ./docker/entrypoint.sh /usr/bin/
+RUN chmod +x /usr/bin/entrypoint.sh
+ENTRYPOINT ["entrypoint.sh"]
+
+EXPOSE 3000
+CMD ["rails", "server", "-b", "0.0.0.0", "-p", "3000"]

docker/Procfile.docker.dev

@@ -0,0 +1,2 @@
+backend: ../bin/rails server -b 0.0.0.0 -p 3000
+frontend: ../bin/webpack-dev-server

docker/entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+# Remove a potentially pre-existing server.pid for Rails.
+rm -f /app/tmp/pids/server.pid
+
+# Then exec the container's main process (what's set as CMD in the Dockerfile).
+exec "$@"