Missing cleanup on buildd-manager

[Haw Loeung]

Hi,

Received an alert about disk usage on alphecca, the current buildd-manager. There's 28G in /tmp and mostly this:

| drwx------ 2 lp_buildd lp_buildd 4096 Jan 26 06:39 gpg-J4JQNz
| drwx------ 2 lp_buildd lp_buildd 4096 Jan 26 12:36 gpg-KnJhFW
| -rw------- 1 lp_buildd lp_buildd 0 Jan 26 12:41 tmp1YYvxy.buildlog
| -rw------- 1 lp_buildd lp_buildd 0 Jan 26 12:41 tmpghGWTq.buildlog
| -rw------- 1 lp_buildd lp_buildd 0 Jan 26 12:41 tmp5LCAC2.buildlog
| drwx------ 2 lp_buildd lp_buildd 4096 Jan 26 18:39 gpg-mzq5_j
| -rw------- 1 lp_buildd lp_buildd 0 Jan 26 18:41 tmpS0l3Il.buildlog
| -rw------- 1 lp_buildd lp_buildd 0 Jan 26 18:41 tmpB7mKQ6.buildlog
| drwx------ 2 lp_buildd lp_buildd 4096 Jan 27 00:18 gpg-6vUj_0
| -rw------- 1 lp_buildd lp_buildd 0 Jan 27 00:41 tmp_eQVoU.buildlog
| drwx------ 2 lp_buildd lp_buildd 4096 Jan 27 06:34 gpg-VNpkNQ
| -rw------- 1 lp_buildd lp_buildd 0 Jan 27 12:03 tmpDbYz7x.buildlog
| ...

By size:

| -rw------- 1 lp_buildd lp_buildd 103M Jan 22 00:41 tmpMNnQLD.buildlog
| -rw------- 1 lp_buildd lp_buildd 279M Jul 29 2020 tmpC0uZxb.buildlog
| -rw------- 1 lp_buildd lp_buildd 279M Jul 29 2020 tmp9T92ac.buildlog
| -rw------- 1 lp_buildd lp_buildd 2.9G Dec 21 00:42 tmp8y4Ky4.buildlog_eGzcxe
| -rw------- 1 lp_buildd lp_buildd 7.2G Nov 13 18:42 tmpT4fmcr.buildlog_FsM2qM
| -rw------- 1 lp_buildd lp_buildd 17G Jan 23 06:10 tmpespAyL.buildlog_Dpk625