Set explicit required components for rustup. (pantsbuild#11420)

### Problem The default components installed for a `rustup` toolchain are not guaranteed to include `cargo`, `clippy`, etc. ### Solution Expand our `rust-toolchain` file to explicitly list the components that we need. We do not pin `rustup` for now, as it generally changes backwards-compatibly. We can revisit that in the future if it continues to change in breaking ways. [ci skip-build-wheels]
ericsun2 · Jan 6, 2021 · 17b1bda · 17b1bda
1 parent 6794015
commit 17b1bda
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1,3 @@
-1.48.0
+[toolchain]
+channel = "1.48.0"
+components = ["cargo", "clippy", "rustfmt", "rustc"]