added gatsby-ssr.js similar to gatsby-browser.js

[mtt87]

to allow for wrapRootComponent(Root) in order to add a <Provider > for server-side rendering (build)

[KyleAMathews]

To fix the test, I believe you just need to add an empty gatsby-ssr to this directory similar to the gatsby-browser there https://github.com/gatsbyjs/gatsby/tree/master/lib/isomorphic

[KyleAMathews]

Sweet thanks!

[jlengstorf]

Hiya @mtt87! 👋

This is definitely late, but on behalf of the entire Gatsby community, I wanted to say thank you for being here.

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