nerdctl insecure registry config (#8339)

* Update prep_download.yml

nerdctl insecure registry config

* Update prep_download.yml

* Update prep_download.yml

apply conversations advice

* Update prep_download.yml

* Update prep_download.yml

* Update prep_download.yml

* Update prep_download.yml

* Update prep_download.yml

* Update prep_download.yml

* Update main.yml

* Update main.yml

* Update prep_download.yml

* Update prep_download.yml