Add known_hosts to Restic's SSH folder

roles/docker/defaults/main.yml

@@ -49,10 +49,11 @@ services:
 
   restic:
     file: restic_backup.yml
-    user: "dc-user"
-    domain: "rynkeby.skovgaard.tel"
+    user: dc-user
+    domain: rynkeby.skovgaard.tel
+    host_key: ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBLGol2G+a87ssy0nu/STKBZSiGyhZhZKx/ujfe9IeFo
     volume_folder: "{{ volume_root_folder }}/restic"
-    repository: "restic"
+    repository: restic
     version: "1.6.0"
     disabled_in_vagrant: true
 

roles/docker/tasks/services/restic_backup.yml

@@ -39,6 +39,14 @@
     group: root
     mode: '0600'
 
+- name: Create SSH known_hosts file
+  template:
+    src: restic.ssh.known_hosts.j2
+    dest: "{{ services.restic.volume_folder }}/ssh/known_hosts"
+    owner: root
+    group: root
+    mode: '0600'
+
 - name: Setup restic backup
   docker_compose:
     project_name: restic_backup

roles/docker/templates/restic.ssh.known_hosts.j2

@@ -0,0 +1 @@
+{{ services.restic.domain }} {{ services.restic.host_key }}