add a dockerignore file ignoring .git directory

[spoonincode]

Change Description

This decreases the docker context ~600MB. I think safe to do?

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Testing Changes

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[scottarnette]

Should be fine. I don't imagine any storage benefits from this since we don't copy the build context in any of our containers. At the very least, this will slightly decrease build times when base images are refreshed.

[spoonincode]

agreed, no real benefit for CI. Mainly was nice when I did a docker build locally to save some time