Majority of the software installed by default in GitHub runners is
irrelevant to OpenZFS. Reclaimed space could be used for more/bigger
vdev files. File deletion happens in the background, leveraging
`systemd-run` - the workflow is not significantly slowed down.
Before
```
Filesystem Size Used Avail Use% Mounted on
/dev/root 84G 53G 31G 63% /
```
After
```
Filesystem Size Used Avail Use% Mounted on
/dev/root 84G 15G 70G 18% /
```
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: szubersk <szuberskidamian@gmail.com>
Closes#13066
