feat: add garage roles and servers

roles/garage/templates/garage.service.j2

@@ -0,0 +1,15 @@
+[Unit]
+Description=Garage Data Store
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Environment='RUST_LOG=garage=info' 'RUST_BACKTRACE=1'
+ExecStart=/usr/local/bin/garage server
+StateDirectory=garage
+DynamicUser=true
+ProtectHome=true
+NoNewPrivileges=true
+
+[Install]
+WantedBy=multi-user.target