fix(restic): attempt to unlock repository at boot

roles/restic/templates/restic-unlock.service.j2

@@ -0,0 +1,21 @@
+[Unit]
+Description={{ restic_job_description }} - Unlock after reboot job
+
+[Service]
+Type=oneshot
+User={{ restic_user }}
+WorkingDirectory={{ restic_systemd_working_directory }}
+SyslogIdentifier={{ restic_systemd_syslog_identifier }}
+
+Environment=RESTIC_REPOSITORY={{ restic_repo_url }}
+Environment=RESTIC_PASSWORD={{ restic_repo_password }}
+{% if restic_s3_key_id and restic_s3_access_key %}
+Environment=AWS_ACCESS_KEY_ID={{ restic_s3_key_id }}
+Environment=AWS_SECRET_ACCESS_KEY={{ restic_s3_access_key }}
+{% endif %}
+
+ExecStartPre=-/bin/sh -c '/usr/bin/restic snapshots || /usr/bin/restic init'
+ExecStart=/usr/bin/restic unlock
+
+[Install]
+WantedBy=multi-user.target