feat(cmd): add installall/uninstallall; fix startall/stopall and service lifecycle

- startall now uses systemctl start (not enable --now)
- stopall now uses systemctl stop (not disable --now)
- add installall command (bulk install with --dry-run support)
- add uninstallall command (bulk disable+remove in reverse order)
- fix docker ExecStart to use -a flag so the process stays attached
- prefix ExecStop with - so a stop-on-already-dead container does not fail the unit

systemd/generator.go

@@ -19,7 +19,7 @@ Requires={{.}}{{end}}
 [Service]
 Type=simple
 ExecStart={{.ExecStart}}
-ExecStop={{.ExecStop}}
+ExecStop={{if .ExecStop}}-{{.ExecStop}}{{end}}
 {{- if .Unit.Restart}}
 Restart=on-failure
 RestartSec={{.Unit.RestartSec}}
@@ -42,7 +42,7 @@ After=default.target
 [Service]
 Type=simple
 ExecStart={{.ExecStart}}
-ExecStop={{.ExecStop}}
+ExecStop={{if .ExecStop}}-{{.ExecStop}}{{end}}
 {{- if .Unit.Restart}}
 Restart=on-failure
 RestartSec={{.Unit.RestartSec}}
@@ -117,7 +117,7 @@ func buildExecCommands(u config.Unit) (start, stop string) {
 		start = fmt.Sprintf("/usr/bin/podman start -a %s", u.Name)
 		stop = fmt.Sprintf("/usr/bin/podman stop %s", u.Name)
 	case "docker":
-		start = fmt.Sprintf("/usr/bin/docker start %s", u.Name)
+		start = fmt.Sprintf("/usr/bin/docker start -a %s", u.Name)
 		stop = fmt.Sprintf("/usr/bin/docker stop %s", u.Name)
 	default:
 		start = fmt.Sprintf("/usr/bin/%s start %s", u.Runtime, u.Name)