create a builder to build the strapi app inside the nx

[santoshyadavdev]

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Configure the builder to build the strapi project inside the nx.

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[santoshyadavdev]

To have the idea about what needs to be included in this builder adding the comment from @ashbrener

#31 (comment)

The gruntfile is create here https://github.com/ashbrener/strapi/blob/ash/strapi-node/apps/strapi-node/Gruntfile.js