Add Docker files, Update rails commands

Dockerfile.development

@@ -0,0 +1,20 @@
+FROM alpine:3.5
+
+ENV BUILD_PKGS="build-base ruby-dev libffi-dev libxml2-dev mariadb-dev" \
+    RUNTIME_PKGS="ruby ruby-json ruby-bigdecimal ruby-irb ruby-bundler ca-certificates mariadb-client" \
+    DEVELOPMENT_PKGS="bash"
+
+RUN apk --no-cache add $BUILD_PKGS $RUNTIME_PKGS $DEVELOPMENT_PKGS
+
+RUN adduser -D -u 1000 -h /srv/app -s /bin/bash app
+WORKDIR /srv/app
+USER app
+
+ENV BUNDLE_JOBS=4 \
+  BUNDLE_PATH=/srv/app/vendor/bundle \
+  GEM_PATH=/srv/app/vendor/bundle:$GEM_PATH \
+  PATH=/srv/app/vendor/bundle/bin:$PATH
+
+EXPOSE 3000
+
+CMD ["bash"]