Prepare for multiple akkounts containers

Initially "web" and "sidekiq"

Dockerfile

@@ -1,8 +1,13 @@
 # syntax=docker/dockerfile:1
 FROM ruby:2.7.6
-RUN apt-get update -qq && apt-get install -y curl ldap-utils
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+RUN apt-get update -qq && apt-get install -y --no-install-recommends curl \
+      ldap-utils tini
 RUN curl -fsSL https://deb.nodesource.com/setup_lts.x | bash -
 RUN apt-get update && apt-get install -y nodejs
+
 WORKDIR /akkounts
 COPY Gemfile /akkounts/Gemfile
 COPY Gemfile.lock /akkounts/Gemfile.lock
@@ -12,11 +17,5 @@ RUN gem install foreman
 RUN npm install -g yarn
 RUN yarn install
 
-# 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"]
+ENTRYPOINT ["/usr/bin/tini", "--"]
 EXPOSE 3000
-
-# Configure the main process to run when running the image
-CMD ["bin", "dev"]