ci: Run tests on debian 12

.gitlab-ci.yml

@@ -26,7 +26,14 @@ test-install-script:
   image: $TEST_IMAGE
   parallel:
     matrix:
-      - TEST_IMAGE: ["debian:10", "ubuntu:focal", "ubuntu:jammy", "debian:11"]
+      - TEST_IMAGE:
+          [
+            "debian:10",
+            "ubuntu:focal",
+            "ubuntu:jammy",
+            "debian:11",
+            "debian:12",
+          ]
   interruptible: true
   before_script:
     - apt-get update && apt-get install -y curl