feat: define docker depenancy

meta/main.yaml

@@ -5,4 +5,5 @@ galaxy_info:
   description: "install and configure an semaphore server"
   license: "MIT"
   role_name: "semaphore"
-dependencies: []
+dependencies:
+  - role: "docker"

playbook.yaml

@@ -5,4 +5,5 @@
   hosts: "all"
   become: true
   roles:
+    - role: "docker"
     - role: "semaphore"

roles/requirements.yml

@@ -1,6 +1,9 @@
 ---
 
 roles:
+  - name: "docker"
+    src: "https://gitlab.simoncor.net/ansible/ans-docker.git"
+    scm: "git"
   - name: "semaphore"
     src: "https://gitlab.simoncor.net/ansible/ans-semaphore.git"
     scm: "git"