patch Bazel on Windows (ci setup)
We have a weird, intermittent bug on Windows where Bazel gets into a
broken state. To investigate, we need to patch Bazel to add more debug
output than present in the official distribution. This PR adds the basic
infrastructure we need to download the Bazel source code, apply a patch,
compile it, and make that binary available to the rest of the build.
This is for Windows only as we already have the ability to do similar
things on Linux and macOS through Nix.
This PR does not contain any intresting patch to Bazel, just the minimum
that we can check we are actually using the patched version.
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The python install step started failing because there is a new pip
release so we get a warning. I tried to just upgrade python but the
new python manifest depends on functions that need an upgrade of scoop
so I upgraded that as well. Not quite sure which of those upgrades
fixes the issue …
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For now this is only used for the daml-helper tests. I’ll shuffle
things around and use it for all tests in a separate PR.
