Add pre-release testing post for 1.61

Author: Mark-Simulacrum

posts/inside-rust/2022-05-16-1.61.0-prerelease.md

@@ -0,0 +1,25 @@
+---
+layout: post
+title: "1.61.0 pre-release testing"
+author: Mark Rousskov
+team: The Release Team <https://www.rust-lang.org/governance/teams/release>
+---
+
+The 1.61.0 pre-release is ready for testing. The release is scheduled for this
+Thursday, May 19th. [Release notes can be found here.][relnotes]
+
+You can try it out locally by running:
+
+```plain
+RUSTUP_DIST_SERVER=https://dev-static.rust-lang.org rustup update stable
+```
+
+The index is <https://dev-static.rust-lang.org/dist/2022-05-16/index.html>. You
+can leave feedback on the [internals thread][internals].
+
+The release team is also thinking about changes to our pre-release process:
+we'd love your feedback [on this GitHub issue][feedback].
+
+[relnotes]: https://github.com/rust-lang/rust/blob/stable/RELEASES.md#version-1610-2022-05-19
+[internals]: https://internals.rust-lang.org/t/rust-1-61-0-prerelease-testing/
+[feedback]: https://github.com/rust-lang/release-team/issues/16