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Adding documentation to show how to set up a GitHub app for private nx
cloud in order to make use of the full github integration.
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## Current Behavior
Private Nx Cloud orgs cannot use the full GitHub integration as they
need to create their own GitHub app and set the required environment
variables.
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## Expected Behavior
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Docs should support the new GitHub integration by providing the
necessary steps to set up the integration.
## Related Issue(s)
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merged. -->
Fixes #
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Co-authored-by: Mark Lindsey <markl@nrwl.io>