Merge pull request #10802 from Icinga/Al2Klimov-patch-3

Add Ubuntu 26.04 to CI workflow

Author: Al2Klimov

.github/workflows/linux.yml

@@ -55,6 +55,7 @@ jobs:
           - ubuntu:24.04
           - ubuntu:25.04
           - ubuntu:25.10
+          - ubuntu:26.04
 
         platform:
           - linux/amd64