Auto merge of #70190 - pietroalbini:gha, r=Mark-Simulacrum

Add GitHub Actions configuration

This PR adds the GitHub Actions configuration to the rust-lang/rust repository. The configuration will be run in parallel with Azure Pipelines until the evaluation finishes: the infrastructure team will then decide whether to switch.

Since GitHub Actions doesn't currently have any way to include pieces of configuration, this also adds the `src/tools/expand-yaml-anchors` tool, which serves as a sort of templating system. Otherwise the configuration is a mostly straight port from the Azure Pipelines configuration (thanks to all the PRs opened in the past).

There are still a few small things I need to fix before we can land this, but it's mostly complete and ready for an initial review.

r? @Mark-Simulacrum

1 files changed, 29 insertions, 0 deletions

diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index b52fbe4666e..5b946b05735 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -750,6 +750,35 @@ impl Step for Tidy {
     }
 }
 
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub struct ExpandYamlAnchors;
+
+impl Step for ExpandYamlAnchors {
+    type Output = ();
+    const ONLY_HOSTS: bool = true;
+
+    /// Ensure the `generate-ci-config` tool was run locally.
+    ///
+    /// The tool in `src/tools` reads the CI definition in `src/ci/builders.yml` and generates the
+    /// appropriate configuration for all our CI providers. This step ensures the tool was called
+    /// by the user before committing CI changes.
+    fn run(self, builder: &Builder<'_>) {
+        builder.info("Ensuring the YAML anchors in the GitHub Actions config were expanded");
+        try_run(
+            builder,
+            &mut builder.tool_cmd(Tool::ExpandYamlAnchors).arg("check").arg(&builder.src),
+        );
+    }
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.path("src/tools/expand-yaml-anchors")
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        run.builder.ensure(ExpandYamlAnchors);
+    }
+}
+
 fn testdir(builder: &Builder<'_>, host: Interned<String>) -> PathBuf {
     builder.out.join(host).join("test")
 }