Bug#977607: auto detect rollup.config.js and rollup -c package.json#scripts#build

[Pirate Praveen]

Package: pkg-js-tools
Severity: wishlist

It'd be nice it pkg-js-tools can detect presence of rollup.config.js 
and rollup -c commands in package.json under scripts#build and run in 
dh_auto_build. Currently we have to create debian/nodejs/build or add 
override_dh_auto_build in rules.

Example module rollup-plugin-sass and probably many more