Add Github workspace as safe directory on commit local Dockerfile for Binder cache

[jerrybonnell]

Address Git security issue that causes Docker builds to suddenly fail.

See #89 (comment) and actions/checkout#760

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[yuvipanda]

Thank you, @jerrybonnell! Were you able to test this somewhere?

[jerrybonnell]

@yuvipanda We are using repo2docker action in this project. Here is our workflow and the passing build.

[yuvipanda]

@jerrybonnell that is a super cool project! Thank you for contributing this fix <3

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