feat; Docker support

Author: MikeRalphson

.dockerignore

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+node_modules/
+npm-debug.log
+.git/

Dockerfile

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+FROM node:alpine
+LABEL maintainer="mike.ralphson@gmail.com" description="OpenAPI 2.0/3.0 CodeGen"
+ENV NODE_ENV=production
+WORKDIR /app
+
+# install deps first (enables layer reuse)
+COPY package.json .
+RUN apk update && apk upgrade && \
+    apk add --no-cache bash git openssh
+RUN npm config set cache /tmp && npm i && rm -rf /tmp/*
+
+# now load the app source
+COPY . .
+EXPOSE 3000
+CMD [ "node", "cg", "--help" ]