system tests leak buildah tmp direcories

[Luap99]

Working on my tmpfs PR I defined a new TMPDIR and after the test I try to remove the tmpdir but this failed rootless with missing permissions, it seems that we have leaked buildah tmp dirs after running the systems test, need to debug further to know which test leaks them

rm: cannot remove '/tmp/CI_19FE/buildah476548106/mnt': Permission denied

[edsantiago]

Directories of the form tmpdir/buildahNNN are (I'm 99% sure) droppings from buildah, not system tests. Perhaps from here https://github.com/containers/buildah/blob/983fa426d03b4348f2d2bd02ad277cd3a5c95595/run_common.go#L1738

[Luap99]

Directories of the form tmpdir/buildahNNN are (I'm 99% sure) droppings from buildah, not system tests. Perhaps from here https://github.com/containers/buildah/blob/983fa426d03b4348f2d2bd02ad277cd3a5c95595/run_common.go#L1738

yes correct, I was not implying that this is a bug in our test code just that executing the tests leaks the files/dirs.

[edsantiago]

One reproducer (there may be more):

$ bin/podman build --authfile=/tmp/bogus - <<<"from scratch" 
Error: credential file is not accessible: faccessat /tmp/bogus: no such file or directory
$ ls -la $TMPDIR/buildah*
total 4
drwx------.  2 esm  esm   60 May  8 10:18 ./
drwxrwxrwt. 38 root root 900 May  8 10:18 ../
-rw-------.  1 esm  esm   13 May  8 10:18 Dockerfile

Curiously, does not reproduce with s/podman/buildah/