ci: use git when running as an Action

src/scripts/verifyEnv.ts

@@ -30,7 +30,12 @@ await logStep("Comparing env.d.ts", async () => {
     return;
   }
 
-  spawn({ cmd: ["sl", "diff", "src/types/env.d.ts"], stdout: "inherit" });
+  const isCI = process.env["IS_CI"] === "true";
+  const vcsCommand = isCI ? "git" : "sl";
+  spawn({
+    cmd: [vcsCommand, "diff", "src/types/env.d.ts"],
+    stdout: "inherit",
+  });
   // add 1 second to make sure spawn completes
   await sleep(1000);
   throw new Error("env.d.ts is out of date");