github: add trixie build

Author: robert-burger

.github/workflows/build-deb.yaml

@@ -13,8 +13,12 @@ jobs:
       PKGNAME: "libethercat"
     strategy:
       matrix:
-        distro: [debian-12, debian-11, ubuntu-24.04, ubuntu-22.04]
+        distro: [debian-13, debian-12, debian-11, ubuntu-24.04, ubuntu-22.04]
         include:
+          - distro: debian-13
+            image: debian:13
+            os: debian
+            version: trixie
           - distro: debian-12
             image: debian:12
             os: debian