Log output cache contents

Makes it easier to debug cache preservation bugs.

tools/cirrus_build_project.sh

@@ -50,6 +50,9 @@ cp -a ./out_cache1/* ./out/ || true
 cp -a ./out_cache2/* ./out/ || true
 cp -a ./out_cache3/* ./out/ || true
 
+echo "Initial output cache contents:"
+find ./out/
+
 echo "Unpacking interrupted cache..."
 ./tools/cirrus_unpack_interrupted.sh || true
 
@@ -116,6 +119,9 @@ fi
 echo "Cleaning containers..."
 rm -rfv out/container-image
 
+echo "Final output cache contents:"
+find ./out/
+
 echo "Splitting caches..."
 rsync -avu --delete ./out/encaya ./out/gocrosssign ./out/gosafetlsa ./out/q ./out_cache1/ || true
 rsync -avu --delete ./out/macosx-toolchain ./out_cache2/ || true