fix(rust_library): honor the --stamp flag by default #3503
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Currently users must explicitly set `stamp = -1` on a `rust_library` that relies on a build env file. https://github.com/bazelbuild/rules_rust/blob/906d1fa6232464b6c704b0d5c431ef8ba5c26010/test/unit/stamp/stamp_test.bzl illustrates this, but in a way that's hard to observe, since it's explicitly setting options everywhere. I think we're also missing a documentation page explaining how to stamp your rust binaries. Whether or not this PR is accepted, I think we also need to write that (unless I missed it somewhere)
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Currently users must explicitly set
stamp = -1on arust_librarythat relies on a build env file.https://github.com/bazelbuild/rules_rust/blob/906d1fa6232464b6c704b0d5c431ef8ba5c26010/test/unit/stamp/stamp_test.bzl illustrates this, but in a way that's hard to observe, since it's explicitly setting options everywhere.
I think we're also missing a documentation page explaining how to stamp your rust binaries. Whether or not this PR is accepted, I think we also need to write that (unless I missed it somewhere)