feat(restic): migrate to systemd template units

roles/restic/defaults/main/config.yml

@@ -0,0 +1,52 @@
+---
+restic_repo_url: ~
+restic_repo_password: ~
+restic_s3_key_id: ~
+restic_s3_access_key: ~
+
+restic_backup_paths: []
+restic_backup_stdin_command: ~
+restic_backup_stdin_command_filename: ~
+restic_backup_generate_metrics_command: >-2
+  {{ restic_script_generate_snapshot_metrics }}
+
+restic_policy_keep_all_within: 1d
+restic_policy_keep_hourly: 12
+restic_policy_keep_daily: 7
+restic_policy_keep_weekly: 6
+restic_policy_keep_monthly: 6
+restic_policy_keep_yearly: 5
+restic_policy_backup_frequency: hourly
+
+restic_base_environment:
+  RESTIC_REPOSITORY: "{{ restic_repo_url }}"
+  RESTIC_PASSWORD: "{{ restic_repo_password }}"
+  RESTIC_JOBNAME: "{{ restic_job_name }}"
+  RESTIC_FORGET_KEEP_WITHIN: "{{ restic_policy_keep_all_within }}"
+  RESTIC_FORGET_KEEP_HOURLY: "{{ restic_policy_keep_hourly }}"
+  RESTIC_FORGET_KEEP_DAILY: "{{ restic_policy_keep_daily }}"
+  RESTIC_FORGET_KEEP_WEEKLY: "{{ restic_policy_keep_weekly }}"
+  RESTIC_FORGET_KEEP_MONTHLY: "{{ restic_policy_keep_monthly }}"
+  RESTIC_FORGET_KEEP_YEARLY: "{{ restic_policy_keep_yearly }}"
+  RESTIC_GENERATE_SNAPSHOT_METRICS_COMMAND: "{{ restic_backup_generate_metrics_command }}"
+
+restic_s3_environment:
+  AWS_ACCESS_KEY_ID: "{{ restic_s3_key_id }}"
+  AWS_SECRET_ACCESS_KEY: "{{ restic_s3_access_key }}"
+
+restic_complete_environment: >-
+  {{
+    restic_base_environment
+    | combine((restic_s3_environment | default({}))
+      if (restic_s3_key_id and restic_s3_access_key) else {})
+    | combine(restic_environment | default({}))
+  }}
+
+restic_policy:
+  keep_within: "{{ restic_policy_keep_all_within }}"
+  hourly: "{{ restic_policy_keep_hourly }}"
+  daily: "{{ restic_policy_keep_daily }}"
+  weekly: "{{ restic_policy_keep_weekly }}"
+  monthly: "{{ restic_policy_keep_monthly }}"
+  yearly: "{{ restic_policy_keep_yearly }}"
+  frequency: "{{ restic_policy_backup_frequency }}"