nixos/image: use stable target dir for amended repart definitions

Output the amended repart definitions to a well-known directory in
$TMPDIR instead of using a temporary directory with a random directory
name.

The output file `repart-output.json` also contains the full path to the
repart definition file used to create the partition. As
`amend-repart-definitions.py` uses `tempfile.mkdtemp`, this introduces
an impurity:

```json
{
        "type" : "root-x86-64",
        "label" : "rootfs",
        "uuid" : "f2fa2e49-e443-45d2-a2e2-c3754cab6363",
        "file" : "/build/tmppjo7kv5o/rootfs.conf",
        "node" : "image.raw2",
        "offset" : 135266304,
        "old_size" : 0,
        "raw_size" : 1651101696,
        "old_padding" : 0,
        "raw_padding" : 0,
        "activity" : "create",
}
```

This commit changes the parent directory of the amended repart
definitions to `/build/amended-repart.d/`.

0 files changed, 0 insertions, 0 deletions