ci: Enabled colored log output in GitHub Actions

Author: ranger-ross

src/bootstrap/src/lib.rs

@@ -26,7 +26,7 @@ use std::sync::OnceLock;
 use std::time::SystemTime;
 use std::{env, io, str};
 
-use build_helper::ci::gha;
+use build_helper::ci::{gha, CiEnv};
 use build_helper::exit;
 use sha2::digest::Digest;
 use termcolor::{ColorChoice, StandardStream, WriteColor};
@@ -1882,7 +1882,9 @@ to download LLVM rather than building it.
         let choice = match self.config.color {
             flags::Color::Always => ColorChoice::Always,
             flags::Color::Never => ColorChoice::Never,
-            flags::Color::Auto if !is_tty => ColorChoice::Never,
+            // GitHub Actions does not report itself as a tty session however having colored output
+            // there is still useful for visually parsing logs.
+            flags::Color::Auto if !is_tty && !CiEnv::is_ci() => ColorChoice::Never,
             flags::Color::Auto => ColorChoice::Auto,
         };
         let mut stream = constructor(choice);