Skip bootstrap tests on CI

Author: Kobzol

src/bootstrap/src/core/build_steps/tool.rs

@@ -1539,7 +1539,7 @@ tool_rustc_extended!(Rustfmt {
     add_bins_to_sysroot: ["rustfmt"]
 });
 
-pub const TEST_FLOAT_PARSE_ALLOW_FEATURES: &'static str = "f16,cfg_target_has_reliable_f16_f128";
+pub const TEST_FLOAT_PARSE_ALLOW_FEATURES: &str = "f16,cfg_target_has_reliable_f16_f128";
 
 impl Builder<'_> {
     /// Gets a `BootstrapCommand` which is ready to run `tool` in `stage` built for

src/bootstrap/src/core/builder/tests.rs

@@ -1995,6 +1995,10 @@ mod snapshot {
         let ctx = TestCtx::new();
         insta::assert_snapshot!(
             ctx.config("test")
+                // Skip bootstrap tests, as for some reason the recursive nature of running
+                // bootstrap tests under bootstrap tests causes non-deterministic snapshot diffs
+                // on CI.
+                .args(&["--skip", "bootstrap"])
                 .render_steps(), @r"
         [build] rustc 0 <host> -> Tidy 1 <host>
         [test] tidy <>