fix: dialogflow integration in docker environments (#3072)

* natively compile ruby gems

* add missing compiler tools

* add bundler platform ruby to force native compilation

* fix bundler env in final docker stage

* add comments to DockerFile

Co-authored-by: Sojan Jose <sojan@pepalo.com>

docker/entrypoints/rails.sh

@@ -20,6 +20,7 @@ done
 
 echo "Database ready to accept connections."
 
+#install missing gems for local dev as we are using base image compiled for production
 bundle install
 
 BUNDLE="bundle check"