Ignore envrc file to ease usage of direnv. (#11267)
Ignore envrc file to ease usage of direnv. (#11267)

[direnv](https://direnv.net/) is a tool that allows setting environment variables based on the current folder.
This PR ignores the direnv config file, which in turn, will allow pants developers to have this file and use it to set enviroment variables (specifically PANTS_XXXXX ones) to configure pants running locally to match their setup.
benjyw/pants,benjyw/pants,pantsbuild/pants,jsirois/pants,jsirois/pants,pantsbuild/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,jsirois/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants