cmd/app: high-level app configuration syntax

This replaces the nixos module.

Signed-off-by: Ophestra <cat@gensokyo.uk>

hst/container.go

@@ -2,6 +2,7 @@ package hst
 
 import (
 	"encoding/json"
+	"fmt"
 	"strings"
 	"syscall"
 	"time"
@@ -161,6 +162,10 @@ type ContainerConfig struct {
 	Flags Flags `json:"-"`
 }
 
+func (c *ContainerConfig) GoString() string {
+	return fmt.Sprintf("&%#v", *c)
+}
+
 // ContainerConfigF is [ContainerConfig] stripped of its methods.
 //
 // The [ContainerConfig.Flags] field does not survive a [json] round trip.

hst/dbus.go

@@ -1,6 +1,7 @@
 package hst
 
 import (
+	"fmt"
 	"strconv"
 	"strings"
 )
@@ -61,6 +62,10 @@ type BusConfig struct {
 	Filter bool `json:"filter"`
 }
 
+func (c *BusConfig) GoString() string {
+	return fmt.Sprintf("&%#v", *c)
+}
+
 // Interfaces iterates over all interface strings specified in [BusConfig].
 func (c *BusConfig) Interfaces(yield func(string) bool) {
 	if c == nil {