update .gitignore

node_modules/pm2/lib/templates/Dockerfiles/Dockerfile-ruby.tpl

@@ -0,0 +1,7 @@
+FROM anapsix/alpine-ruby:latest
+
+RUN apk update && apk add git && rm -rf /var/cache/apk/*
+RUN npm install pm2@next -g
+RUN mkdir -p /var/app
+
+WORKDIR /var/app