ci: force ubuntu 22.04 for nightly build

To ensure a better compatibility.

Author: krichprollsch

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
       ARCH: x86_64
       OS: linux
 
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@v4