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Create dedicated Dockerfile with Python 3.6 to reduce CI time #7352
Every time we run a Docker shard, we spend about 3 minutes installing Python 3.6 and its dependencies, even if that shard never once uses Python 3. In particular, this slows down our
Ideally, we would want Python 3 pre-installed on the base Centos6 image so that we never for any shard have to waste time installing Python 3 (see #7064). Until that lands, though, this is an additional unneeded burden.
Create a new image
Thanks to how we can now parametrize the docker image name in
Also does a little cleanup from #7351 in removing a bad env var