Rollup merge of #129917 - Kobzol:fix-beta-git, r=Mark-Simulacrum

Fix parsing of beta version in dry-run mode

This was blocking beta release.

r? `@BoxyUwU`

src/bootstrap/src/lib.rs

@@ -1501,6 +1501,7 @@ fn extract_beta_rev_from_file<P: AsRef<Path>>(version_file: P) -> Option<String>
                     "refs/remotes/origin/{}..HEAD",
                     self.config.stage0_metadata.config.nightly_branch
                 ))
+                .run_always()
                 .run_capture(self)
                 .stdout()
         });