Add build output option (#11)

Fixes #6

Also updates dependencies

Co-authored-by: Lauris BH <lauris@nix.lv>
Reviewed-on: https://codeberg.org/woodpecker-plugins/plugin-docker-buildx/pulls/11
Reviewed-by: anbraten <anbraten@noreply.codeberg.org>
Co-authored-by: Lauris BH <lafriks@noreply.codeberg.org>
Co-committed-by: Lauris BH <lafriks@noreply.codeberg.org>

cmd/docker-buildx/config.go

@@ -238,5 +238,11 @@ func settingsFlags(settings *plugin.Settings) []cli.Flag {
 			Usage:       "sets target platform for build",
 			Destination: &settings.Build.Platforms,
 		},
+		&cli.StringFlag{
+			Name:        "output",
+			EnvVars:     []string{"PLUGIN_OUTPUT"},
+			Usage:       "sets build output type and destination configuration",
+			Destination: &settings.Build.Output,
+		},
 	}
 }