Only setup *_PROXY env variables where needed (#7095)

no_proxy is a pain to get right, and having proxy variables present causes issues
(k8s components get proxy configuration after upgrade, see #7100)

It's better to only configure what require proxy:
- the runtime (containerd/docker/crio)
- the package manager + apt_key
- the download tasks

Tested with the following clusters
- 4 CentOS 8 nodes
- 1 Ubuntu 20.04 node

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

roles/container-engine/crun/tasks/main.yml

@@ -11,9 +11,11 @@
     path: "{{ crun_bin_dir }}/crun"
   register: crun_stat
 
+# TODO: use download_file.yml
 - name: Download binary
   get_url:
     url: "{{ crun_release_url }}"
     dest: "{{ crun_bin_dir }}/crun"
     mode: '0755'
   when: not crun_stat.stat.exists
+  environment: "{{ proxy_env }}"