docker: new role that is common to all docker VMs

hosts

@@ -4,3 +4,5 @@ gw21.regensburg.freifunk.net
 gw31.regensburg.freifunk.net
 stats.ffrgb ansible_host=10.90.224.100
 unms.ffrgb ansible_host=10.90.224.101
+unifi.ffrgb ansible_host=10.90.224.102
+tiles.ffrgb ansible_host=10.90.224.103

roles/docker/tasks/main.yml

@@ -0,0 +1,17 @@
+---
+
+- name: Enable docker apt-key
+  apt_key: url='https://download.docker.com/linux/debian/gpg'
+
+- name: Enable docker repository
+  apt_repository:
+    repo: 'deb https://download.docker.com/linux/debian buster stable'
+    filename: docker
+
+- name: Install docker
+  apt:
+    name:
+    - docker-ce
+    - docker-ce-cli
+    - containerd.io
+    - docker-compose

site.yml

@@ -31,3 +31,8 @@
   roles:
   - prometheus
   - grafana
+
+- name: Setup docker servers
+  hosts: [unms.ffrgb, unifi.ffrgb, tiles.ffrgb]
+  roles:
+  - docker