ISSUE #971: chore(gha): downsize swap partition to 256M

Author: jiridanek

ci/cached-builds/gha_lvm_overlay.sh

@@ -10,7 +10,7 @@ set -Eeuo pipefail
 # root_reserve_mb=2048 was running out of disk space building cuda images
 root_reserve_mb=4096
 temp_reserve_mb=100
-swap_size_mb=4096
+swap_size_mb=256
 
 build_mount_path="${HOME}/.local/share/containers"
 build_mount_path_ownership="runner:runner"