tests: Terraform RPM available only on x86_64

according to
https://www.hashicorp.com/blog/announcing-the-hashicorp-linux-repository
https://discuss.hashicorp.com/t/rhel-8-aarch64-rpms/24244/3

and
https://github.com/hashicorp/packer/issues/11516

Don't execute azure.sh if the runner is not x86_64

.gitlab-ci.yml

@@ -516,11 +516,13 @@ aws.sh:
   extends: .integration
   variables:
     SCRIPT: aws.sh
-    
+
 azure.sh:
   extends: .integration
   variables:
     SCRIPT: azure.sh
+  rules:
+    - if: '$RUNNER =~ /[\S]+x86_64[\S]+/'
 
 # The required GCE image type is not supported on Fedora
 gcp.sh: