Merge branch '2599-run-less-stable-unit-tests-in-aws-v9_18' into 'v9_18'

[v9_18] Run unstable unit tests in CI

See merge request isc-projects/bind9!5806

.gitlab-ci.yml

@@ -676,6 +676,7 @@ unit:gcc:buster:amd64:
       artifacts: true
 
 # Jobs for regular GCC builds on Debian 11 "bullseye" (amd64)
+# (The second unit test job also executes unstable unit tests.)
 
 gcc:bullseye:amd64:
   variables:
@@ -699,6 +700,20 @@ unit:gcc:bullseye:amd64:
     - job: gcc:bullseye:amd64
       artifacts: true
 
+unit:gcc:bullseye:unstable:amd64:
+  <<: *debian_bullseye_amd64_image
+  <<: *unit_test_job
+  variables:
+    CI_ENABLE_ALL_TESTS: 1
+  needs:
+    - job: gcc:bullseye:amd64
+      artifacts: true
+  only:
+    - api
+    - schedules
+    - triggers
+    - web
+
 # Jobs for cross-compiled GCC builds on Debian 11 "bullseye" (amd64) with
 # 32-bit libraries