build: add .bazelrc to disable Python toolchains
#2535
Merged
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Summary:
This expands our forward-compatibility window to at least 0.29.0rc4 by
opting out of the
--incompatible_use_python_toolchainsflag whosedefault was flipped in 0.27.0 (see #2355).
Fixes #2534.
Test Plan:
On Bazel 0.29.0rc4, verify that
//tensorboardfetches, builds, andruns correctly and that all tests pass, without the need to manually
specify any flags to Bazel.
wchargin-branch: bazelrc-toolchains