GitLab CI: Enable RHEL 8.5 and installers.sh

Add RHEL 8.5 runners and run new installers.sh integration test.

.gitlab-ci.yml

@@ -80,7 +80,7 @@ Prepare-rhel-internal:
   parallel:
     matrix:
       - RUNNER:
-          - aws/rhel-8.4-x86_64
+          - aws/rhel-8.5-x86_64
         INTERNAL_NETWORK: ["true"]
 
 Base:
@@ -107,6 +107,7 @@ Base:
           - aws/centos-stream-8-aarch64
       - RUNNER:
           - aws/rhel-8.4-x86_64
+          - aws/rhel-8.5-x86_64
           # see COMPOSER-918
           # - aws/rhel-8.4-aarch64
         INTERNAL_NETWORK: ["true"]
@@ -224,6 +225,20 @@ API:
         INTERNAL_NETWORK: ["true"]
         DISTRO_CODE: ["rhel_90"]
 
+Installer:
+  stage: test
+  extends: .terraform
+  rules:
+    - if: '$CI_PIPELINE_SOURCE != "schedule"'
+    - if: '$CI_PIPELINE_SOURCE == "schedule" && $RUNNER =~ /[\S]+rhel-[8-9]\.[\S]+/'
+  script:
+    - schutzbot/deploy.sh
+    - /usr/libexec/tests/osbuild-composer/installers.sh
+  parallel:
+    matrix:
+      - RUNNER:
+          - openstack/rhel-8.5-x86_64
+
 finish:
   stage: finish
   tags: