This include assumes build, lint and test commands in your package.json.
`build` should export the build into `dist` folder.
If the production build needs a different command, set the variable `PROD_BUILD_COMMAND`:
`build` should export the build into `dist` folder. If the staging and/or production build needs a different command, set the variables `STAGE_BUILD_COMMAND` & `PROD_BUILD_COMMAND`:
```yaml
variables:
PROD_BUILD_COMMAND: "npm run ng build --prod=true"
STAGE_BUILD_COMMAND: "yarn build-stage"
PROD_BUILD_COMMAND: "yarn build-prod"
```
It will create a nginx docker image with a default config.