Search for underscores in `systemd-stub`

Building raw disk images of RHEL 9 x86-64 are failing with:
```
...‣ Unable to determine systemd-stub version, found '#### LoaderInfo: systemd-stub 252-46.el9_5.2 ####'
```

Changes the regex for `systemd-stub` to include underscores for RHEL95.

diff --git a/mkosi/__init__.py b/mkosi/__init__.py
index d01baf64402ae9f8b768ced2caadc7e7ab68ba3e..aca3ef558ea97a6958f9e01197016835bc9d34ff 100644 (file)
--- a/mkosi/__init__.py
+++ b/mkosi/__init__.py
@@ -1849,7 +1849,7 @@ def systemd_stub_version(context: Context, stub: Path) -> Optional[GenericVersio
 
     if not (
         version := re.match(
-            r"#### LoaderInfo: systemd-stub (?P<version>[.~^a-zA-Z0-9-+]+) ####", sdmagic_text
+            r"#### LoaderInfo: systemd-stub (?P<version>[.~^a-zA-Z0-9-+_]+) ####", sdmagic_text
         )
     ):
         die(f"Unable to determine systemd-stub version, found {sdmagic_text!r}")