Auto merge of #69252 - Mark-Simulacrum:disk-try, r=<try>

Dump largest files on disk, not just in cwd.

This will try to debug the disk space issues we're seeing (and potentially
become the "fix" PR).

r? @ghost

Author: bors

src/ci/scripts/dump-environment.sh

@@ -17,3 +17,9 @@ set +o pipefail
 du . | sort -nr | head -n100
 set -o pipefail
 echo
+
+echo "biggest files:"
+set +o pipefail
+du -a / 2>/dev/null | sort -nr | head -n100
+set -o pipefail
+echo