Explicitly blacklist nouveau when installing from CUDA repos

This should avoid failures encountered in some RHEL 8 tests

tasks/install-redhat.yml

@@ -44,7 +44,14 @@
   when: nvidia_driver_add_repos | bool
 
 - name: install dependencies
-  yum: name=dkms
+  yum:
+    name: dkms
+    state: present
+
+- name: blacklist nouveau
+  kernel_blacklist:
+    name: nouveau
+    state: present
 
 - name: add repo
   yum_repository:

tasks/install-ubuntu-cuda-repo.yml

@@ -20,6 +20,10 @@
   environment: "{{proxy_env if proxy_env is defined else {}}}"
   when: nvidia_driver_add_repos | bool
 
+- name: blacklist nouveau
+  kernel_blacklist:
+    name: nouveau
+    state: present
 
 - name: add repo
   apt_repository: