Fix setup for development with docker (PR #523)

Dockerfile-dev

@@ -0,0 +1,39 @@
+FROM ruby:2.3
+
+# Install dependencies
+RUN deps='libmagic-dev xvfb qt5-default libqt5webkit5-dev gstreamer1.0-plugins-base gstreamer1.0-tools gstreamer1.0-x' && \
+    apt-get update && \
+    apt-get install --no-install-recommends -y $deps && \
+    rm -Rf /var/lib/apt/lists/* /var/cache/apt/*
+
+ENV PORT=3000 \
+    SMTP_SERVER_PORT=2525 \
+    RAILS_ENV=development \
+    RAILS_LOG_TO_STDOUT=true \
+    RAILS_SERVE_STATIC_FILES=true \
+    \
+    BUNDLE_PATH=/home/app/bundle \
+    BUNDLE_APP_CONFIG=/home/app/bundle/config
+
+# Run app and all commands as user 'app'. This avoids changing permissions
+# for files in mounted volume. Symlink for similarity with production image.
+RUN adduser --gecos GECOS --disabled-password --shell /bin/bash app && \
+    ln -s /home/app/src /usr/src/app
+USER app
+
+WORKDIR /home/app/src
+
+# Copy files needed for installing gem dependencies, and install them.
+COPY Gemfile Gemfile.lock ./
+COPY plugins ./plugins
+RUN bundle config build.nokogiri "--use-system-libraries" && \
+    bundle install -j 4
+
+# Copy the application code
+COPY . ./
+
+EXPOSE 3000
+
+# cleanup, and by default start web process from Procfile
+ENTRYPOINT ["./docker-entrypoint.sh"]
+CMD ["./proc-start", "web"]