Rollup merge of rust-lang#134924 - ranger-ross:cleanup-ci-output, r=Kobzol

ci: Cleanup docker build logs in CI

Cleaning up the CI logs to make reviewing CI failures easier. This PR adds a `::group` around the docker tag hash input which is pretty large (250+ lines) and is probably not relevant for most people.

Related to rust-lang#134910 , see this [comment](rust-lang#134910 (comment))

Author: matthiaskrgr

src/ci/docker/run.sh

@@ -76,8 +76,9 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
     # Include cache version. Can be used to manually bust the Docker cache.
     echo "2" >> $hash_key
 
-    echo "Image input"
+    echo "::group::Image checksum input"
     cat $hash_key
+    echo "::endgroup::"
 
     cksum=$(sha512sum $hash_key | \
     awk '{print $1}')