Add package-lock.json file for administration and storefront npm install

[AndreasA]

With current shopware production template all plugin dependencies call a npm install for all installed plugins in admin and storefront build processes:
https://github.com/shopware/production/blob/v6.4.5.1/bin/build-storefront.sh#L32

This means that the npm install is triggered and currently there is no package-lock.json so it might result in wrong dependency versions being installed.

However, I think the installation isn't required at all, see: #217

[boxblinkracer]

Hi

thank you for this

yes you are right
at the moment theres no lock file.
might have been missed in git

ill add it :)
should definitely be in there

[boxblinkracer]

locks are now existing in the main branch in the upstream :)
thank you for reporting this