Add BP about bootstraping using node instead of npm

sections/docker/bootstrap-using-node.md

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+# Bootstrap container using node command instead of npm
+
+## One paragraph explainer
+
+We are used to see code examples where folks start their app using `CMD 'npm start'`. This is a bad practice. The `npm` binary will not forward signals to your app which prevents graceful shutdown (see #716). If you are using Child-processes they won’t be cleaned up correctly in case of unexpected shutdown, leaving zombie processes on your host. `npm start` also results in having an extra process for no benefit. To start you app use `CMD ['node','server.js']`.
+
+### Code example
+
+```dockerfile
+
+FROM node:12-slim AS build
+WORKDIR /usr/src/app
+COPY package.json package-lock.json ./
+RUN npm ci --production && npm clean cache --force
+
+CMD ['node', 'server.js']
+```
+
+### Antipatterns
+
+Using npm start
+```dockerfile
+
+FROM node:12-slim AS build
+WORKDIR /usr/src/app
+COPY package.json package-lock.json ./
+RUN npm ci --production && npm clean cache --force
+
+# don’t do that!
+CMD “npm start”
+```
+
+Using node in a single string will start a bash/ash shell process to execute your command. That is almost the same as using `npm`
+
+```dockerfile
+
+FROM node:12-slim AS build
+WORKDIR /usr/src/app
+COPY package.json package-lock.json ./
+RUN npm ci --production && npm clean cache --force
+
+# don’t do that, it will start bash
+CMD "node server.js"
+```
+
+Starting with npm, here’s the process tree:
+```
+$ ps falx
+  UID   PID  PPID   COMMAND
+    0     1     0   npm
+    0    16     1   sh -c node server.js
+    0    17    16    \_ node server.js
+```
+There is no advantage to those two extra process.
+
+Sources:
+
+
+https://maximorlov.com/process-signals-inside-docker-containers/
+
+
+https://github.com/nodejs/docker-node/blob/master/docs/BestPractices.md#handling-kernel-signals