feat: wip implement port forwarding

internal/docker/docker.go

@@ -2,6 +2,7 @@ package docker
 
 import (
 	"context"
+	"fmt"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/go-connections/nat"
 	"strconv"
@@ -19,3 +20,16 @@ func ContainerSSHHostPort(ctx context.Context, container types.ContainerJSON) in
 	}
 	return port
 }
+
+// ContainerHostPort finds the host port that is exposing the given container port
+func ContainerHostPort(ctx context.Context, container types.ContainerJSON, port int) int {
+	ports := container.NetworkSettings.Ports[nat.Port(fmt.Sprintf("%d/tcp", port))]
+	if len(ports) == 0 {
+		return -1
+	}
+	port, err := strconv.Atoi(ports[0].HostPort)
+	if err != nil {
+		return -1
+	}
+	return port
+}