distribution: do not default to release=VERSION_ID for openSUSE Tumbleweed

`config_default_release()` calls `detect_distribution()` to get the default
release if it's not set, which picks the value from os-release's `VERSION_ID`.
In openSUSE Tumbleweed this property has the snapshot number. Since
`mkosi-initrd` does not set `Release=` via config, mkosi thinks that it's Leap
and fails:

```
$ mkosi-initrd
‣ Validating certificates and keys
‣ Building main image
‣  Copying in sandbox trees…
‣  Installing openSUSE
Warning: Enforced setting: $releasever=20251217
Loading repository data...
Reading installed packages...
'Leap-release' not found in package names. Trying capabilities.
No provider of 'Leap-release' found.
‣ "zypper --installroot=/buildroot --cache-dir=/var/cache/zypp --non-interactive --no-refresh --releasever=20251217 --no-gpg-checks install --download in-advance --no-recommends --force-resolution filesystem Leap-release" returned non-zero exit code 104.
‣ "mkosi --force --directory= --format=cpio --output=initrd --output-directory=/tmp/tmpcvx9let7 --extra-tree=/usr/lib/modules/6.17.0-2-default:/usr/lib/modules/6.17.0-2-default --extra-tree=/usr/lib/firmware:/usr/lib/firmware '--remove-files=/usr/lib/firmware/*-ucode' --build-sources= --include=mkosi-initrd --kernel-modules=host --extra-tree=/usr/lib/modules/6.17.0-1-default/updates/hdaps.ko:/usr/lib/modules/6.17.0-1-default/updates/hdaps.ko --extra-tree=/usr/lib/modules/6.17.0-1-default/updates/thinkpad_ec.ko:/usr/lib/modules/6.17.0-1-default/updates/thinkpad_ec.ko --extra-tree=/usr/lib/modules/6.17.0-1-default/updates/tp_smapi.ko:/usr/lib/modules/6.17.0-1-default/updates/tp_smapi.ko --package-cache-dir=/var --cache-only=metadata --output-mode=600 --include /usr/lib/mkosi-initrd --include /etc/mkosi-initrd --sandbox-tree=/tmp/tmp0tjr7mwr --extra-tree=/etc/vconsole.conf:/etc/vconsole.conf" returned non-zero exit code 104.
```

Fixes 0b701c690ddcf3543bc1a698a1977ea390dbfd36

diff --git a/mkosi/distribution/__init__.py b/mkosi/distribution/__init__.py
index 2b8b632bd1ea7b2912f68064b4f112fdd39622e9..e59025acafaabdf143c89cd7ee188b937c99d753 100644 (file)
--- a/mkosi/distribution/__init__.py
+++ b/mkosi/distribution/__init__.py
@@ -162,7 +162,7 @@ def detect_distribution(root: Path = Path("/")) -> tuple[Optional[Distribution],
 
     dist_id = os_release.get("ID", "linux")
     dist_id_like = os_release.get("ID_LIKE", "").split()
-    version_id = os_release.get("VERSION_ID", None)
+    version_id = os_release.get("VERSION_ID", None) if dist_id != "opensuse-tumbleweed" else "tumbleweed"
     version_codename = os_release.get("VERSION_CODENAME", None)
 
     quirks = {