fix deprecated apt signing key location

README.md

@@ -25,6 +25,7 @@ All services below are running under Docker, except NSD and Borg.
 
 - matrix
 - peertube?
+- Pixelfed?
 
 ## TODO
 

roles/docker/tasks/main.yml

@@ -9,9 +9,10 @@
 - name: Add Docker APT key
   apt_key:
     url: https://download.docker.com/linux/ubuntu/gpg
+    keyring: /etc/apt/keyrings/docker.gpg
 - name: Add Docker repository
   apt_repository:
-    repo: "deb https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable"
+    repo: "deb [signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable"
   register: apt_repository
 - name: Update APT cache
   apt: