CI: Test with newer RabbitMQ versions

Version 3.6/3.7 are super old and unsupported,
let's test with newer, supported versions instead.

We still want to support v3.8, since that's the last one
that doesn't require any extra configuration (i.e. setting longer
timeouts), but this version is tested as part of normal tests in ci-code.yml

Since AiiDA interacts with RabbitMQ only via the kiwipy interface,
it's unlikely that changes to AiiDA would break it. Therefore, the
RabbitMQ tests are moved to the nightly run.

.github/workflows/nightly.yml

@@ -21,7 +21,7 @@ concurrency:
 
 jobs:
 
-  tests:
+  nightly-tests:
 
     if: github.repository == 'aiidateam/aiida-core'      # Prevent running the builds on forks as well
     runs-on: ubuntu-latest
@@ -88,3 +88,49 @@ jobs:
         SLACK_COLOR: b60205
         SLACK_TITLE: Nightly build of `aiida-core/main` failed
         SLACK_MESSAGE: The tests of the `nightly.yml` GHA worklow failed.
+
+
+  # Run a subset of test suite to ensure compatibility with latest RabbitMQ releases
+  rabbitmq_tests:
+
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # Currently supported RMQ versions per:
+        # https://www.rabbitmq.com/docs/which-erlang#compatibility-matrix
+        rabbitmq-version: ['3.11', '3.12', '3.13']
+
+    services:
+      postgres:
+        image: postgres:16
+        env:
+          POSTGRES_DB: test_aiida
+          POSTGRES_PASSWORD: ''
+          POSTGRES_HOST_AUTH_METHOD: trust
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+        - 5432:5432
+      rabbitmq:
+        image: rabbitmq:${{ matrix.rabbitmq-version }}-management
+        ports:
+        - 5672:5672
+        - 15672:15672
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install aiida-core
+      uses: ./.github/actions/install-aiida-core
+
+    - name: Install system dependencies
+      run: sudo apt update && sudo apt install postgresql
+
+    - name: Run tests
+      run: pytest -sv -k 'requires_rmq'