Docker Pull Auto - Automatically pull docker images when push | Idea of this project is to pull docker images automatically on server whenever there is push. Also deletes old image if exist

In software developement, it’s common requirement to have multiple config based on environment. You can have multiple environments like dev, qa, stage etc.
docker pull auto uses NODE_ENV environment variable for multiple config management. Format for reading config is config.{process.env.NODE_ENV}.json. Let suppose we need to create a separate config for development. To create multiple config, you will need to follow following steps:

Create a config.development.json in root
Now you will need to pass development value in NODE_ENV environment variable.

You will need to add two scripts in package.json in scripts section. One for local development and one for build

"start:development": "cross-env NODE_ENV=development nest start --watch --webpack --webpackPath ./config/nest-webpack.config.js"
"build:development": "cross-env NODE_ENV=development nest build --webpack --webpackPath ./config/nest-webpack.config.js"

Now run your new added script to test on local via command
```
npm run start:development
```
This project supports auto deployment on push. For ease already have workflow config in folder .github/workflows with name build-and-push-dev.yml.bak. Just rename this file. If you compare build-and-push.yml with build-and-push-dev.yml.bak then you will find, we only changed build command from npm run build to npm run build:development

NOTE: If you will not pass NODE_ENV then config.json will use as config file