restore $PORT support, remove explicit ports mapping

The MCP agent assigns its own host port and sets $PORT. The app must
listen on $PORT for mc-proxy to reach it. Explicit Podman port mappings
in the service definition are ignored by the agent.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

deploy/kls-rift.toml

@@ -9,10 +9,6 @@ kls = "Dockerfile"
 [[components]]
 name = "kls"
 image = "mcr.svc.mcp.metacircular.net:8443/kls:v0.1.0"
-network = "mcpnet"
-user = "0:0"
-restart = "unless-stopped"
-ports = ["127.0.0.1:48000:3030", "100.95.252.120:48000:3030"]
 volumes = ["/srv/kls:/srv/kls"]
 cmd = ["-f", "/srv/kls/kls.conf"]
 

main.go

@@ -6,6 +6,7 @@ import (
 	"log"
 	"net"
 	"net/http"
+	"os"
 
 	"git.wntrmute.dev/kyle/goutils/config"
 	"git.wntrmute.dev/kyle/goutils/die"
@@ -29,10 +30,15 @@ func main() {
 	srv := &server{db: db}
 	http.Handle("/", srv)
 
-	addr := net.JoinHostPort(
+	var addr string
+	if port := os.Getenv("PORT"); port != "" {
+		addr = ":" + port
+	} else {
+		addr = net.JoinHostPort(
 			config.Get("HTTP_ADDR"),
 			config.GetDefault("HTTP_PORT", "8000"),
 		)
+	}
 	log.Print("listening on ", addr)
 	log.Fatal(http.ListenAndServe(addr, nil))
 }