copr: run ansible mount on each machine not just in aws

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -211,7 +211,6 @@
 
 - name: mount cache filesystem on /var/cache/mock
   mount: path=/var/cache/mock state=mounted src=mock_cache_tmpfs fstype=tmpfs opts="size=32G"
-  when: mock_var_cache_tmpfs is defined
 
 - name: Collect facts about builder hardware
   setup:

roles/copr/backend/templates/provision/aws_cloud_vars.yml

@@ -7,8 +7,6 @@ builder_images:
   x86_64: "{{ copr_builder_images.aws.x86_64 }}"
   aarch64: "{{ copr_builder_images.aws.aarch64 }}"
 
-mock_var_cache_tmpfs: true
-
 aws_arch_subnets:
   x86_64:
     - subnet-0995f6a466849f4c3