roles/docker: Make repokey fingerprint overrideable (#7263)

This makes the docker role work the same as the containerd role.
Being able to override this is needed when you have your own debian
repository. E.g. when performing an airgapped installation

roles/container-engine/docker/defaults/main.yml

@@ -28,9 +28,11 @@ docker_rh_repo_gpgkey: 'https://download.docker.com/linux/centos/gpg'
 # Ubuntu docker-ce repo
 docker_ubuntu_repo_base_url: "https://download.docker.com/linux/ubuntu"
 docker_ubuntu_repo_gpgkey: 'https://download.docker.com/linux/ubuntu/gpg'
+docker_ubuntu_repo_repokey: '9DC858229FC7DD38854AE2D88D81803C0EBFCD88'
 # Debian docker-ce repo
 docker_debian_repo_base_url: "https://download.docker.com/linux/debian"
 docker_debian_repo_gpgkey: 'https://download.docker.com/linux/debian/gpg'
+docker_debian_repo_repokey: '9DC858229FC7DD38854AE2D88D81803C0EBFCD88'
 docker_bin_dir: "/usr/bin"
 
 # flag to enable/disable docker cleanup

roles/container-engine/docker/vars/debian.yml

@@ -23,7 +23,7 @@ docker_package_info:
 docker_repo_key_info:
   url: '{{ docker_debian_repo_gpgkey }}'
   repo_keys:
-    - 9DC858229FC7DD38854AE2D88D81803C0EBFCD88
+    - '{{ docker_debian_repo_repokey }}'
 
 docker_repo_info:
   repos:

roles/container-engine/docker/vars/ubuntu.yml

@@ -23,7 +23,7 @@ docker_package_info:
 docker_repo_key_info:
   url: '{{ docker_ubuntu_repo_gpgkey }}'
   repo_keys:
-    - 9DC858229FC7DD38854AE2D88D81803C0EBFCD88
+    - '{{ docker_ubuntu_repo_repokey }}'
 
 docker_repo_info:
   repos: